64 Dart Vert Top interchange and questions

1964 Dart convertible top, will it fit other makes like a Valiant? or just maybe 63/66 Darts?
Is the back seat bottom convertible only? It looks like it.
Are the side windows convertible only?
I got a lot of parts form a buddy who turned his car into a drag only car, and am going to see it.....so want to get my info correct.
Andrew/Kidd