From my manual, p21:
"Programming Additional Key Fobs
Programming the key fob may be performed by an authorized dealer.
NOTE:
Once a key fob is programmed to a vehicle, it cannot be repurposed and reprogrammed to another vehicle.
Request For Additional Key Fobs
NOTE:
Only key fobs that are programmed to the vehicle electronics can be used to start and operate the vehicle. Once a key fob is programmed to a vehicle, it cannot be programmed to any other vehicle."
Has anyone tried to reprogram the key from a dealer from another car? The original key is supposed to be reprogrammed and cleaned so at least they told me on the Jeep dealer but later failed. In Poland, we have a Jeep service at Fiat, we must show them with our finger what to do.