"height" ie the height of the disk from the back of the friction surface to the wheel face
Means that the cupra disk sat 12mm futher out than the S4 one, and is also 2mm thinner...
However, if we compare the 312mm TT disk and the 312mm B6 A4 disk, we see the same difference, 35mm for the TT and 47mm for the A4, so i would presume that means the caliper mounting lugs are in a different place on the hub and therefore take up the difference
The only concern would be the difference in thickness, you may find theres enough room to get a 30mm disk mounted inside the caliper, or there may not be, its close, but you'll only know for sure by bolting them on.