Member Directory different templates based on members.php file's copies with different headers.

functions.php

/* For this snippet
members2.php - custom Member Directory template filename in "wp-content/themes/your-theme/ultimate-member/templates/" path.
members-grid2.php - custom Grid template, customized only for members2.php template, its path is "wp-content/themes/your-theme/ultimate-member/members-grid2.php"
*/

add_filter( 'um_get_template', 'my_member_directory_templates', 10, 4 );
function my_member_directory_templates( $located, $template_name, $path, $t_args ) {

	if ( $template_name == 'members-grid.php' ) {
		if ( ! empty( $t_args['template'] ) && $t_args['template'] == 'members2' ) {
			if ( ! empty( $t_args ) && is_array( $t_args ) ) {
				extract( $t_args );
			}

			$path = '';
			$basename = UM()->member_directory()->get_type_basename( 'grid' );
			if ( $basename ) {
				// use '/' instead of "DIRECTORY_SEPARATOR", because wp_normalize_path makes the correct replace
				$array = explode( '/', wp_normalize_path( trim( $basename ) ) );
				$path  = $array[0];
			}

			$template_name = 'members-grid2.php';

			$located_custom = UM()->locate_template( $template_name, $path );
			if ( ! file_exists( $located_custom ) ) {
				_doing_it_wrong( __FUNCTION__, sprintf( '<code>%s</code> does not exist.', $located ), '2.1' );
				return $located;
			}

			$located = $located_custom;
		}
	}

	return $located;
}