Bucket Seat & Foam Info Please

Hey FABO,

I have been doing some research on here, and have found some relevant threads but don't see the answer I'm looking for.

I'm building a '70 Duster. I picked up bucket seats from a '72 Duster. I have already mounted them in the car, so I know the seat tracks are good (although I do have a question about them, that's coming in another post).

My question is about the seat foam vs seat frame.

I have:
1970 seat covers
1972 seat frames
I'm getting ready to buy the seat foams

Obviously, the seat covers will work with '70 seat foams.
But will the '70 foams work with the '72 seat frames?
Or, would I be better off working the '70 seat covers onto '72 foams (A/B/E body) which should work with the frames?

I appreciate any help you can give.