Are 70-72 A-body bench seats the same?

When I got my 70 Dart it had a 72 Duster or Dart bench and rear seat in it. The front bench has the center armrest. I know that 70 Darts didn't come with a center armrest bench seat but I'm not concerned about originality. It appears though that I am going to have to use either 70 Duster or 71/72 Dart/Duster covers when I get the seats redone. My question is are all 70-72 A-body front and rear seat frames the same? I am leaning toward the design of the 70 Duster upholstery over the 71 and 72 Duster/Dart designs but I want to be sure that 70 Duster seat covers are going to fit my 72 seat frames before I order them. I talked to someone at Legendary but they couldn't say for sure. Thanks in advance for your help.

+1 Waiting for an informed answer.

I don't know for sure, but have been told the 1970 and 1971 seat frames are the same. On Dusters, the 1970 and 1971 bench seats used different headrests, while the 1972 bench, at some point during the 1972 production year, went to a fully integrated headrest (non-detachable).

The 1972 Darts as i vaguely recall used a different bench from the Duster and Demon.

Hopefully some one pops in, and gives us a good answer!