My recent shop project had a mix of face frame and inset drawers. I think maybe the face frame are OK as far as being able to go the full cabinet depth but the inset drawers are where 2" shorter was called for. They make some sort of extra brackets that work with the face frame drawers and there will be numerous experts here on those. I skipped that and just glued/bradded some ply filler strips inside to get the slide where they cleared the face frames, but in my case that was just 1/2". If you've got 1-1/2" I think you'd want to get the extra hardware.