The majority of the PN remains the same except the end 9XX
5X - low line
6X - mid line
7X - high line
with the last X being the immobiliser version
0 is the first gen, then 1, 2, 3, 4 etc
I have not seen a GTI cluster like yours with 1K0 and an 8XX on the end so assume it is not a GTI. The GTI PN is 1K6 920 9XX like what you bought.
The PN equiv needs to match yours, so would say 1K6920974 and that is not a home DIY job