Comparison of _tranche as first parameter vs after _from address

TrancheFirst.sol

interface ERC777Token {
    function name() public view returns (string);
    function symbol() public view returns (string);
    function totalSupply() public view returns (uint256);
    function balanceOf(address owner) public view returns (uint256);
    function granularity() public view returns (uint256);

    function defaultOperators() public view returns (address[]);
    function authorizeOperator(address operator) public;
    function revokeOperator(address operator) public;
    function isOperatorFor(address operator, address tokenHolder) public view returns (bool);

    function send(address to, uint256 amount, bytes data) public;
    function operatorSend(address from, address to, uint256 amount, bytes data, bytes operatorData) public;

    function burn(uint256 amount, bytes data) public;
    function operatorBurn(address from, uint256 amount, bytes data, bytes operatorData) public;

    event Sent(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 amount,
        bytes data,
        bytes operatorData
    );
    event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);
    event Burned(address indexed operator, address indexed from, uint256 amount, bytes operatorData);
    event AuthorizedOperator(address indexed operator, address indexed tokenHolder);
    event RevokedOperator(address indexed operator, address indexed tokenHolder);
}

interface IERCPFT is ERC777Token {

    function getDefaultTranche(address _owner) external view returns (bytes32);
    function setDefaultTranche(bytes32 _tranche) external;
    function operatorSetDefaultTranche(bytes32 _tranche, address _owner) external;
    
    function balanceOfByTranche(bytes32 _tranche, address _owner) external view returns (uint256);
    
    function sendByTranche(bytes32 _tranche, address _to, uint256 _amount, bytes _data) external returns (bytes32);
    function sendByTranches(bytes32[] _tranches, address[] _tos, uint256[] _amounts, bytes _data) external returns (bytes32);
    function operatorSendByTranche(bytes32 _tranche, address _from, address _to, uint256 _amount, bytes _data, bytes _operatorData) external returns (bytes32[]);
    function operatorSendByTranches(bytes32[] _tranches, address[] _froms, address[] _tos, uint256[] _amounts, bytes _data, bytes _operatorData) external returns (bytes32[]);
    
    function trancheByIndex(address _owner, uint256 _index) external view returns (bytes32);
    function tranchesOf(address _owner) external view returns (uint256);
    
    function defaultOperatorsByTranche(bytes32 _tranche) public view returns (address[]);
    function authorizeOperatorByTranche(bytes32 _tranche, address _operator) public;
    function revokeOperatorByTranche(bytes32 _tranche, address _operator) public;
    function isOperatorForTranche(bytes32 _tranche, address _operator, address _owner) public view returns (bool);

    event SentByTranche(
        bytes32 indexed fromTranche,
        bytes32 toTranche,
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 amount,
        bytes data,
        bytes operatorData
    );
    event MintedByTranche(bytes32 indexed tranche, address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);
    event BurnedByTranche(bytes32 indexed tranche, address indexed operator, address indexed from, uint256 amount, bytes operatorData);
    event AuthorizedOperatorByTranche(bytes32 indexed tranche, address indexed operator, address indexed tokenHolder);
    event RevokedOperatorByTranche(bytes32 indexed tranche, address indexed operator, address indexed tokenHolder);
}

interface IERCST is IERCPFT, IERC165 {

    function getDocument(bytes32 _name) public view returns (string, bytes32);
    function setDocument(bytes32 _name, string _uri, bytes32 _documentHash) public;
    
    function finishMinting(bytes32 _declaration) public;
    function mintable() public view returns (bool);
    
    function verifySendTranche(address _from, address _to, bytes32 _tranche, uint256 _amount, bytes _data) public view returns (byte, bytes32, bytes32);
    
    function mint(bytes32 _tranche, address _owner, uint256 _amount, bytes _data) public;
    function burn(bytes32 _tranche, address _owner, uint256 _amount, bytes _data) public;
}

TrancheSecond.sol

interface ERC777Token {
    function name() public view returns (string);
    function symbol() public view returns (string);
    function totalSupply() public view returns (uint256);
    function balanceOf(address owner) public view returns (uint256);
    function granularity() public view returns (uint256);

    function defaultOperators() public view returns (address[]);
    function authorizeOperator(address operator) public;
    function revokeOperator(address operator) public;
    function isOperatorFor(address operator, address tokenHolder) public view returns (bool);

    function send(address to, uint256 amount, bytes data) public;
    function operatorSend(address from, address to, uint256 amount, bytes data, bytes operatorData) public;

    function burn(uint256 amount, bytes data) public;
    function operatorBurn(address from, uint256 amount, bytes data, bytes operatorData) public;

    event Sent(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 amount,
        bytes data,
        bytes operatorData
    );
    event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);
    event Burned(address indexed operator, address indexed from, uint256 amount, bytes operatorData);
    event AuthorizedOperator(address indexed operator, address indexed tokenHolder);
    event RevokedOperator(address indexed operator, address indexed tokenHolder);
}

interface IERCPFT is ERC777Token {

    function getDefaultTranche(address _owner) external view returns (bytes32);
    function setDefaultTranche(bytes32 _tranche) external;
    function operatorSetDefaultTranche(address _owner, bytes32 _tranche) external;
    
    function balanceOfByTranche(address _owner, bytes32 _tranche) external view returns (uint256);
    
    function sendByTranche(bytes32 _tranche, address _to, uint256 _amount, bytes _data) external returns (bytes32);
    function sendByTranches(bytes32[] _tranches, address[] _tos, uint256[] _amounts, bytes _data) external returns (bytes32);
    function operatorSendByTranche(address _from, bytes32 _tranche, address _to, uint256 _amount, bytes _data, bytes _operatorData) external returns (bytes32[]);
    function operatorSendByTranches(address[] _froms, bytes32[] _tranches, address[] _tos, uint256[] _amounts, bytes _data, bytes _operatorData) external returns (bytes32[]);
    
    function trancheByIndex(address _owner, uint256 _index) external view returns (bytes32);
    function tranchesOf(address _owner) external view returns (uint256);
    
    function defaultOperatorsByTranche(bytes32 _tranche) public view returns (address[]);
    function authorizeOperatorByTranche(address _operator, bytes32 _tranche) public;
    function revokeOperatorByTranche(address _operator, bytes32 _tranche) public;
    function isOperatorForTranche(address _operator, address _owner, bytes32 _tranche) public view returns (bool);

    event SentByTranche(
        address indexed operator,
        address indexed from,
        bytes32 indexed fromTranche,
        address indexed to,
        bytes32 toTranche,
        uint256 amount,
        bytes data,
        bytes operatorData
    );
    event MintedByTranche(address indexed operator, address indexed to, bytes32 indexed tranche, uint256 amount, bytes data, bytes operatorData);
    event BurnedByTranche(address indexed operator, address indexed from, bytes32 indexed tranche, uint256 amount, bytes operatorData);
    event AuthorizedOperatorByTranche(address indexed operator, address indexed tokenHolder, bytes32 indexed tranche);
    event RevokedOperatorByTranche(address indexed operator, address indexed tokenHolder, bytes32 indexed tranche);
}

interface IERCST is IERCPFT, IERC165 {

    function getDocument(bytes32 _name) public view returns (string, bytes32);
    function setDocument(bytes32 _name, string _uri, bytes32 _documentHash) public;
    
    function finishMinting(bytes32 _declaration) public;
    function mintable() public view returns (bool);
    
    function verifySendTranche(address _from, address _to, bytes32 _tranche, uint256 _amount, bytes _data) public view returns (byte, bytes32, bytes32);
    
    function mint(address _owner, bytes32 _tranche, uint256 _amount, bytes _data) public;
    function burn(address _owner, bytes32 _tranche, uint256 _amount, bytes _data) public;
}