The Gv line is a 2wd buggy and the Sb series is a 4wd buggy.
The convert the GV2 RTR to a GV2 Pro you will need (I don't know all of but I do know some it). Adjustable turnbuckles, ball diff, slipper clutch setup, threaded shock bodies to name a few. Your better off buying the Pro version as it would be cheaper in the long run. Converting at RTR to Pro versions from any company is the more expensive way to go.