That looks to ba a 964 28x298 rotor on the right, What rotor is on the left?
When comparing 964RS/t 322x32 to 993 322x32 I think that the height difference was ~5mm
964RS came w/ 7.5x17ET55 & 9x17ET55 wheels 205/50 & 255/40 tires, factory spec for track is 1379/1380mm
964 base wheels were 6ET52 & 7ET55 wheels 205/55 & 225/50 x16 tires, factory spec track is 1380/1374mm
964 option was 7ET55 & 9ET55 wheels, 205/50 & 255/40 x17 tires, factory spec track is 1374/1374mm
993 base 7ET55 & 9ET70 wheels 205/55 & 245/45 x16 tires, factory spec track is 1405/1444mm
993 option was 7ET55 & 9ET70 wheels, 205/50 & 255/40 x17 tires, factory spec track is 1405/1474mm, rear also used 9x17ET55, I believe that the 9ET70 used a spacer but I've never seen those wheels so don't know for sure the spec is for the 9ET55 wheel
993RS was 8ET52 & 10ET65 wheels 225/40 & 265/35 x18 tires, 1413/1452mm