1. AcmeDemoException.php

<?php

// src/Acme/DemoBundle/Exception/AcmeDemoException.php
namespace Acme\DemoBundle\Exception;

/**
 * Special interface for AcmeDemoBundle exceptions
 */
interface AcmeDemoException
{
}

2. InvalidArgumentException.php

<?php

// src/Acme/DemoBundle/Exception/InvalidArgumentException.php
namespace Acme\DemoBundle\Exception;

/**
 * The InvalidArgumentException for the AcmeDemoBundle, it implements the AcmeDemoException interface.
 */
class InvalidArgumentException extends \InvalidArgumentException implements AcmeDemoException
{
}

3. AcmeOtherException.php

<?php

// src/Acme/OtherBundle/Exception/AcmeOtherException.php
namespace Acme\OtherBundle\Exception;

/**
 * Special interface for AcmeOtherBundle exceptions
 */
interface AcmeOtherException
{
}

4. InvalidArgumentException.php

<?php

// src/Acme/OtherBundle/Exception/InvalidArgumentException.php
namespace Acme\OtherBundle\Exception;

/**
 * The InvalidArgumentException for the AcmeOtherBundle, it implements the AcmeOtherException interface.
 */
class InvalidArgumentException extends \InvalidArgumentException implements AcmeOtherException
{
}

Now you can throw the correct exception class and catch all of them for one bundle using:

try {
    // ...
} catch (AcmeDemoException $e) {
    // acmedemobundle exceptions
} catch (AcmeOtherBundle $e) {
    // acmeotherbundle exceptions
}