Duster Bumper Question

Hi everybody, Can anyone tell me if there is a difference between 74 Duster rear bumber and 75 Duster rear bumper. They are both the impact bumper styles but is the 75 slightly different from 74 or are they interchangeable? I have a chance to scoop a rechromed 75 for my 74 but I want to make sure it will fit. Thanks to anyone who can help or check a part number or interchange for me. A-Bodies rule!