Will 4 door seats fit in 2 door, same year?

RedFish said

From what I think I recall, A Duster rear bench is different even from other 2 door a-bodies. The duster seat back is taller to a higher package shelf. It would stick up in the back window of a Dart or Valiant.
Any 4 door rear seat bottom will fall short in width to a 2 door interior.

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Duster's/Demon's/Dart Sport's won't swap upper rear seat backs with 2 door Dart's/Scamp's/Valiant's, the seats are a different height. I'm not positive about the 4-doors, because I believe those were also different from the 2 door cars. I know the roof line was taller, the 4 doors used narrower and taller windshield's.