63-66 a-body rear seat interchange?

Just to add what I've found out, the two door and four door seats are different too, they'll probably fit but they have a different 'curve' where it meets the side of the car, or the door on the 4 door. I suppose just because on the 4 door it's more curved to facilitate getting in and out of the door, and on the 2 door it butts up flatter against the side of the car.