Dirty ebayer selling VIN tag, etc

I have done some research recently on "re bodies" and found laws are different from state to state. If you legally own both cars and have the paperwork for both, it's perfectly legal... They have been doing it on trucks for years and years. How many cummins dodge trucks are out there that have replacement cabs etc... And they just changed the dash over? Mopar guys are the only ones that seem to make such a big deal about it all. I personally don't see the difference of taking a really nice 318 charger and changing all the R/T parts over vs buying the whole AMD cataloge. So you have part of the original firewall, is that enough to say its not a re body? How many of those new mustang bodies have original vins? It's a state to state thing as long as you have proof of ownership for both cars.

Is it morally correct, well that's up for debate. But legality wise it depends where it's done...