It is not possible for this too loop more than twice
$select_fields = array( 'boat-bow', 'boat-stern');
foreach ( $select_fields as $var ){
add_filter('acf/load_field/name=' . $var . '-select', load_select );
}
}
// function should be outside of loop
function load_select () {
global $var;
var_dump($var);
}