The front calipers are much bigger.
There are probably part numbers listed on forums if you search.
The PP GTI brakes are the same as the Clubsport (non S) and the R (albeit differently painted calipers) and the Leon Cupra.
Somewhere out there someone will have done a retrofit.
Thanks, if I go ahead (it's actually for another car) I would need to source used set of calipers/carriers. I managed to dig out some part numbers from ETKA so will post those in case anyone else needs them...
Front
Caliper, red, left - 5G0 615 123 A
Caliper, red, right - 5G0 615 124 A
Carrier, red, left - 5G0 615 125 A
Carrier, red, right - 5G0 615 126 A
Pads - 8V0 698 151 C
Discs, 340x30mm - 1K0 615 301 AD
Backplate, left - 5Q0 615 311 F
Backplate, right - 5Q0 615 312 F
Rear
Caliper, red, left - 5Q0 615 423
Caliper, right - 5Q0 615 424
Carrier, red - 5Q0 615 425
Pads - 3Q0 698 451
Retaining spring - 8V0 615 269
Discs, 310x22mm - 1K0 615 601 N
Backplate, left - 5Q0 615 611 N
Backplate, right - 5Q0 615 612 N