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

Can't imagine that seat mounts from 70-72 are different. The 70 seats had the oval shaped adjustable headrest. Not sure about the 71s. Three different styles of bench seats were used in 1972. The first was the bench with a center armrest. The seat back release these seats was a rectangular button mounted high on the seatback. There was also a lowback bench without a center armrest, but it was only available in 4-door models. The third type was the highback seat with integral head restraints. All were available as all vinyl or vinyl with cloth inserts. The all vinyl, low back seats and bucket seats had metal inserts. The highback, integral headrest seats did not.