Draw from multiple collections?

Wondering if this is possible...

using perch_content, I was able to have to pass in _id values from several different regions and get back a list:

<?php perch_content_custom(array('Case Studies','Downloads','Other Resource Links'),  array(
    'page'=>'*',
    'template'=>'carousel/_our_approaches_documents.html',
    'filter'=> '_id',
    'match'=>'in',
    'value'=>$get_ids,
    'sort-order'=>'ASC',
)); ?>

would this same thing be possible using collections?

Thanks, Monty