The amps
should be the same. However, there are separate versions for Platinum and Artist/Professional. There have been situations where people couldn't load the correct version and if you can't, they sound pretty...uh...well, "wretched" is an accurate description. I sometimes wonder if some people think the amps sound bad because they don't have the right version and don't know what the right version sounds like...
Maybe save the Amp FX chains from the Showcase to your CA-X amps folder and overwrite the existing ones? Right-click on the amp GUI and select "Save FX Chain Preset."
By the way I'm working on a new CA-X amp called "Brash Pop." It kind of occupies the place between the Hard Rock amp's "stadium" sound, and the more "pawn shop prize" sound of the Vintage Crunch amp. Here's a sneak preview...I think it's slated for the November release.