Once Artisan is working you may remove SBC or Artisan 4, but you do not have to. However, there is really no need to keep older versions once Artisan is installed. Artisan contains ALL the features of SBC/Artisan 4 and lots more. You will not lose any projects or art kits by uninstalling. You are removing the programs, not your data.
Click HERE for full instructions on uninstalling programs.