Swap my 72 seat for a 68 seat, question

[General23cmp]

Had to change seats in my 72. Had a 68 given to me. The back springs and foam are different, but the bottom springs and foam look the same. The 68 seat folds where the original 72 was rigid. I hope to be able to recover it with a factory correct houndstooth, but am unsure if the cover will tightly fit the different 68 setup. Can anyone provide me with any insight? I may just need to find another 72-ish seat. Thanks.