I think I remember buying one of these "flat" handles for my challenger back in 1984/5, the plastic gasket didn't get pinched evenly by the flange around the handle, and I thought the handle didn't quite nestle well in its place either!
I took it back to the dealer and started a fight with somebody there! LOL, I was young and....
I bet when chrysler went for "one type fits all" for 72/74 handles , it was for keeping the accountants happy, it wasn't for keeping the "fit" correct.
I would still choose door handles for my cars based on the door contour, no matter what the year.