I seriously doubt that they're the same engine. The Wii version of SW:TFU is being developed in Australia, but the Clone Wars games are developed at Lucasarts Singapore. The Clone Wars games are exclusives to Nintendo platforms (meaning it was built ground-up for the Wii), while TFU is multiplatform (I'm not sure if the developer is also making the PS2 versions, I think they are). TFU is obviously developed with a single player campaign in mind, however they've only talked about a 1P campaign for Clone Wars DS, and not even mentioned the topic for the Wii version, suggesting that the Wii Clone Wars may be mostly a 1 vs 1 fighter game...