All the cars are designed for race, that's why are pro kits.
X1 CRT has a bigger spur 62, whereas x2 CRT is 48. Internal gear ratio is different, x2 CRT diff is spiral, x2 CRT chassis is narrower n longer, all electronics n engine moved towards the center, x2 CRT has 16mm big bore shocks.
It's not worth it to upgrade x1 to x2 I made that mistake before, the chassis, universal, big bore, gears will cost u like a used x2 CRT.
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Looking at picking up an x1 crt, wondered which motor mount to go with. I'm thinking I read somewhere that the x1 mount limits gearing, and the buggy, x2 mount works better.