Are 63 & 64 b-body door panels the same size?

They should interchange as the doors themselves are the same but they have the different interior patterns year/model...

Thanks. That is what I was looking for.

63 is different, 64/65 are the same. I don't know if that goes for the panels as well, but the doors don't interchange.

63-65 post cars(2-dr. sedans) will interchange except for pattern differences.64 & 65 hardtops will also interchange with each other.

So are you saying 63 & 64 hardtops won't fit each other?

A 63 hardtop has the same roofline as the sedan(63&64), the door panel follows that contour,has a portion on the rearward that raises slightly to match that shape.The 64 hardtop has a different roofline and that door panel is flat along its length.

The 63 hardtop door will interchange with the 64&65 doors, as will the sedan doors,you could even use the front door panels. The rear door panels are the problem because of the roofline.