'71 Duster bucket seats......Will 72 covers work?

the 72 seat covers will fit for sure. the only thing I'm not sure about is the "pillow head rest" on the 72 seat cover. Is it in the seat cover already or is it part of the foam for the seat? Rear seats will fit....

Not sure about the headrest.
So all rear seat covers are the same size - just different pattern?
Are all (70-76) rear frames the same? besides the fold-downs of course.
Thanks!

Wally.