The only non-painting difference there is, is that you on the Vettel version cant change the gear ratio. Its stock on 507 km/h (i believe it is), while on the 2 others, you can change it.
They all have the exact same stats, but the S. Vettel has its gearbox settings locked to ~500 km/h and the other 2 can be customized. The standard X2010 and the unpainted carbon prototype are identical.
None of the x2010's can be painted. Not even the one from the dealership (which is the same as the one you get for silvering the challenges).