Scruffs_subie

Ive been looking to get a catback system for my 03 outback vdc sedan, and im aware that its essentially an 03 legacy with a single exaust setup. My main question here is, how different are the ez30d and ez30r when it comes to the exaust from the cat. If its similar enough could I bold a single cat from the 2.5 ej20 onto the ez30.