72 Dart Question

I want to do a large bolt pattern swap on my 72 dart. I found a 74 duster parts car that has the front disc brakes and rear end. I know the front brakes will work but will the rear end also fit? I want disc brakes but I don't want 2 different bolt patterns on my car. I'm assuming that it should just be a simple swap being how they are both a-body vehicles, but I'm no expert. Thanks in advance for the help.
Author: twood21