1968 Dart GTS 340
Well…… A re-body and a clone are 2 different things. A clone will still have a vin that says /6, 318 or whatever.
A re-body of a performance model will have a vin (and/or other documentation) that says, 340, 440, Hemi or whatever……
I know it's crazy. Like your example………
"but I don't see anything different from a real car and one that has been built exactly like the real car and is not different in any way."
The difference may only be 1 letter on the vin tag but people will pay extra for that 1 letter even on a re-body that may only have 2% of the original car left.
You are correct in your point that no cars are gained in a re-body, It is a simple transfer of numbers.
Pure documentation fraud is another story.