A Prime Problem

There are suddenly two Optimus Primes running around giving the genuine article and the other Autobots a lot to digest. Figuring out which Optimus is which proves very difficult for the Autobots. One is the original, while the other is merely a Decepticon-created copy. This has all been orchestrated by Megatron, as the bait for a deadly chasm trap. Will the Autobots be able to see through this ruse, and is there anything that Optimus can do to prove his identity?