Interesting. I was going to say, the 67-69 Dart and Barracuda used the same top frame. I wonder, if the different part number is due to something relatively trivial like the shape of the rear window opening? Or just the colors available?
In '66, the Dart and Valiant use the same top mechanism. I believe the '65 is the same as a '66, but, not 100% positive. I also believe that some of the '63-4 parts are different than the later models. It would take looking up each part number and comparing them between the '63-6 parts manuals.