Hi @juanpablob
The above is very similar to another question here:
http://support.advancedcustomfields.com/forums/topic/relationship-between-flexible-content-post/
The repeater and flexible content save data in the same way, so you will both end up with very similar code.
Please read over the linked documentation articles to see how you can filter the WP_Query args and allow for sub field values int he meta_query.
Thanks
E