Interesting if they can $50 about pays for buying an empty fob on eBay and having it cut. Best ask if that includes the RFID chip.
Have verified that just cloning on a 7931 or 7935 does not work. Had to pay about 50% more for 7930s but should be here next week.
While the RKE bit (circuit board in fob) may use a rolling code, I don't think the RFID part does. I do think it has a checksum that includes the chip identifier so must have the same chip model.
Can see everything with the $35 tool and latest batch of chips (promised 7930s) was also $35.

Chip that works.



Chip that does not work: