There is indeed a part number on an original as well as pentastar, and 7 digit vendor code all found together on the bottom srea of an original Challenger trim ring.
AMD nor any other reproduction Challenger trim ring has any numbers on them and are made of aluminum whereas originals are made of zinc.
There are reproduction Cuda trim rings with all the numbers like original Cuda but no has done that in Challenger.
Original zinc ring is quite a bit heavier than an aluminum ring obviously.
Studs are about 1/16 - 1/8 longer on the repro.