I know it's a bit weird, but I just read on the Teletraan-1 website, they stated in the Cybertron two-pack with RID Prime and Ultra Magnus, RID Optimus Prime is indeed the same Optimus Prime as in Armada, Energon, and Cybertron. This is also indicated in the Cybertron comic. Though that isn't a huge surprise to me. They all have supermodes, yellow eyes, and a similar "head" design. Though RID Prime bares some slight resemblance to pre-Armada Optimus Prime.