Anyone know what parts are the same or is it pretty much everything?

I picked up a 78 atc90 for the kids to ride and I lots of ct90 parts left over from my build including new 1mm over piston that the 3 wheeler needs

I am also looking at adding more power to my ct90 using some of the atc tricks like a trx125 crank
Should mention I have a full machine shop and I worked as a tool and die maker so I'm pretty sure I can pull off the machine work including making a new rod that's shorter with a 14mm wrist pin to match my ct90 piston

Thanks