Carpintis varies greatly though, from pearling color to shape, size, pattern, distribution etc.
Not all Carpintis can get the amazing colors and patterns of a SGT (hence why they're called 'Super'), or even come close. I've always thought that the 'stock standard' Green Texas has considerably less coloration/attractive pearling attributes so I personally don't really think that it's a hybrid.
Possible of course, but I wouldn't be so quick to put it past natural variations.