The AMC cap is one piece, not two pieces like the Chrysler road wheel center cap. The dimensions are very different as well as seen above.
Motor Wheel produced the AMC caps for the aftermarket as well at the time without the metal bands used by AMC. They also made the similar looking but completely different center caps for our Road Wheels. The greater volume from the aftermarket plus AMC and the fact that they were a one piece part made them much less expensive to produce than the Chrysler caps.
Bob Baker of ABC Moparts already scoped out the cost of reproducing the Chrysler center caps at my request a few years ago now (but from China as a starter) but even from there, the price was prohibitive given the potential volume and too many folks on this site dissed anything made from China, so the project was dropped.