Modern electronics = Full rewire

I actually use a combo of both. The way the 73 is drawn can be a brain screw. So I revert to the 72 and compare. ALWAYS compare and check

So far as Dodge vs Plymouth, there is no difference except stuff like whether a car has or could have come with a Ralley dash, etc etc. They are the same car. It's just that they WERE printed and sold separately, and that is the way MyMopar.com organizes them