Doors & floor

Have a ´65 V200 station wagon that my dad bought when I was six. It would later be my first car but got left behind after high school was done. Twenty six years later I'm trying to bring it back to life.
I´ve noticed that all Valiants seem to have a 106" wheelbase and are 188.2" long. Are the floor pans the same for the wagon/2-door/4-door??
Also, are the back doors the same (interchangeable) between the wagon and the four door sedan??
Finally, can I use the fuel tank fom a sedan in my wagon. (The catalogs online seem to all look the same)