- 745

- United States
I am not an expert but did some quick research and found this:
https://en.wikipedia.org/wiki/Group_C vs. https://en.wikipedia.org/wiki/IMSA_GT_Championship#GTP_Era
And this explanation from Porsche: https://www.porscheroadandrace.com/porsche-956-962-engines-group-c-vs-imsa/
I hope that answers yoour question.
Thank you, my friend. Sort of related to this, I was able to find free, even better quality versions of the cars that replace the SDD GTP's that I bought a while back, so I was able to delete the SDD ones. Shweeet.