It would be both easy and costly
I have them both (although they are the kit ones) and you would need chassis, shock towers, arms, wheels, bumpers, rear shocks, driveshafts...
To be honest it would be easier to list the bits you
don't need. The SC is so much bigger then the buggy the only bits I can remember being teh same would be the steering parts and diff / gearbox
At the price the RTR SC's are now just buy one of those it would be far easier and cheaper.
HTH
G