73 to 72 Dodge Dart door swap

You can as long as you swap the entire door with all of its internal hardware. The window glass, window lift hardware, door handle positioning and locking hardware is all different. So what you can’t do is buy a ‘70-‘72 door shell and then re-use any of the ‘73 door guts.

Your interior door panels won’t exactly match either, and you’ll need to use the earlier door panels as the interior door handles and window crank locations changed