If you have the parts manuals for all models in question, you can do a product parts #'s comparison for each car.
I did this for my Polara and the 65 Fury lll I bought floor pans for and it was an exact match.
From what little I understand, is that the front floor pan is the same for many Mopar's in the full sized range and the only difference is the rear filler section.
The really bizarre thing for mine is the donor floor pan was from a 4 door and it measured out perfectly for my 2 dr convertible..