The normal GTI has the 312mm disc calipers (57mm piston) painted red.....the GTE has the same calipers but painted blue, & the GTD & other cars with the DCC option have the grey painted versions...there is NO name plate.
The 340mm disc PP option for the GTI uses the "R"/CCS" calipers which are 60mm pistons & a different caliper design to the 57mm piston ones. These calipers allow the fitment of a "name plate" , which can have "R", GTI, or Clubsport written on it. The calipers may be painted black for R, silver for "R-Performance" or red for GTI PP....
Simples...