Are 1964, 1965, and 1966 barracuda and 2 door valiant doors the same and interchangeable?

64 to 66 Barracuda , Valiant and Dart doors are the same. They may have different holes for mounting trim clips. 63 Valiant and Dart are even the same but they have a different striker mechanism and a different opening for that. The opening can be modified to fit but requires a bit of body work to not be noticable.