I saw on another mk7 site that it was the same tyre as used by Porsche, but a different load rating...
Porsche use N rated ones but there is no difference in them.
Porsches N rated tyres go through a very expensive homlogation process with the tyre manufacturer with the tyre being custom developed to suit the spec demanded by vehicle manufacturer.
VW chose an N rated tyre which is a Porsche fitment, this is probably not unrelated to the fact that the chassis development team leader used to work for Porsche and therefore knew exactly how an N rated Cup 2 tyre would benefit the Clubsport S compared to a non-N rated version - for example a slightly stiffer sidewall.
So if you are replacing Cup 2s, especially not as a full set, I'd always get the N rated version.
I think the first question is probably does the OP stlll have the car given it was 2017 when he asked the question!

'N' rated is a Porsche approval confirming that the tyre was tested and approved at the Nurburgring hence the 'N'. Makes sense that Schebsdat would use it given where they were going for the record and his work on the 997 RS.
Marketing teams love hyping it all up at launch. My favourite is the ambiguity they like to create with 'limited production' and 'limited edition'. This gets shorthanded to 'limited' invariably.