Rear window gasket, vinyl top versus non vinyl differences?

Trying to wrap my head around a different rear window gasket for a 1969 Swinger with a vinyl top versus a non vinyl top car?
Some places that sell the gasket do not break out a vinyl top car, then there is Laysons, they break out a vinyl top Dart versus a non vinyl top Dart. And a vinyl top gasket is a bit more expensive?