The only similarity, to me, is that omnimovers and FJ both move you through the ride. Omnimovers have chain drives or something similar where FJ is a bench on the end of a robotic arm on a track. Also, omnimovers generally don't have any more range of motion than turning and maybe bouncing (ex. Cat In The Hat, Pooh) whereas FJ has a full range of motions, including up/down/sideways, rolling. The boat rides at WDW have more in common with omnimovers than FJ. However, it's kind of a pointless argument as it is really based on how we perceive ride technology.