All the 68-73 (USA spec) and 68-present (Euro/Mexi) bumpers are the same, Super or not. The USA spec 74-79 bumpers are indeed shaped the same but just thicker and more reinforced.

I can't tell you if what you want to put together will work, you may have to change to early model bumper brackets (and fenders) because of those long "shock" bumper mounts on the late car.

However, to simply answer your question, yes all the bumpers are shaped the same (front/front or rear/rear, but not front/rear).