I can tell you there's at least one difference....might be an older CT bulb, but for what it's worth...
Pinballbulbs domed ones don't work in Future Spa controlled inserts. They strobe like crazy, as does every other LED...EXCEPT...wait for it...
CT super (and PBL 1-leds, but that's not the point here..). So if they're the same bulb, copied....then why is there different behavior? One is able to cope with the 50hz lamp matrix, and the other isn't. Clearly there's at least SOME marginal difference. I wish I had a "current release" CT Super to try out in the game, just to see if they've changed something to where they no longer work in my game.
Someone needs to come out with some Old-Bally-Certified LEDs, that's for sure. I ain't buying a 150 buck Alltek driver board just for LEDs.