Maybe the Hellcat is the same, some others like the .40 Zero are much different. I know Raidentech sells both Hellcats, they list different manufacturers and about $50 difference in the price. I can't say I have had both in my hands to know the exact difference though. As far as the CG goes, It is risky to use CMP CG figures even on thier own planes. They sometimes are a bit off the mark.