Has one of the devs said that ? because that's not what i have read mon ami
Honestly, I cannot specifically remember 100% where I heard it, but I'm pretty sure it was a interview with Ted Price somewhere around TGS or Gamer's Day saying that both games are built around the same engine, and that obviously since Ratchet is not out until well after Resistance is released that the engine will be much improved over Resistance.
I'll look around and try to find it. But I'm interested in what you have read about Ratchet & Clank.