Hello
Actally there is only one 916 in existance. A german made a copy on a 914 and let sign the papers to a Typ 916 with a VIN/chassis' 916. The TÜV made the error to sign Porsche as manufactorer in to the papers and Porsche didn´t had been amused but couldn´t force the TÜV change that.
There are some spots to identify original cars but if you are in the buisiness you can copy a GT or a 916. It is just finding the parts and pay them and finding the correct papers and VIN´s.
Grüsse
Grüsse