I don't know if the hard top is the same as convert, but if it is 68 up it is automatically designed for the stainless strip vs the chromed plastic lock strip.
Yes, the Gasket/Weatherstrip is different between the Convertible and the Hardtop, that I know.
All 67-69 Barracuda/Dart convertibles used the same gasket that used the chrome PLASTIC trim lock strip.
What I'm trying to find out is can you use the 68+ hardtop gasket and add clips for the bottom stainless steel trim.