I believe that in a lot of states the titles will be different after a part of the vehicle has been changed that had a VIN stamping, probably showing the vehicle as rebuilt or reconstructed. This leaves a paper trail and shows that the mods were done according to the law of that state. Harley motorcycles have the factory VIN stamped in the engine cases and the frame. My 77 Harley had new aftermarket engine cases installed by the previous owner. Arizona had the bike titled as a reconstructed Harley and even assigned an Arizona VIN startin with AZ, which was stamped on the factory frame and the aftermarket engine cases. The reconstructed designation on the title carried over onto my New Mexico title. This was all done according to the laws of the state in which it was done and was state inspected, and is therefore legal. Different states have different ways of going about doing these things, and it's not controlled by the federal government, so it may be different from one state to the next. The issue here was changing out VIN stamped parts from one vehicle to another which would result in a car with 2 different VINs on the car. THAT is illegal in any state as far as I'm aware.