Replying to myself above.
Now that I hunt this down further, I think I understand my initial confusion over the GMC configurator. It all comes down to differences in Denali engine choice.
I believe it still might
NOT be possible to configure the Duramax version of the MY2025 4WD Yukon XL, including "Denali Reserve" (PCN) and "Premium Capability Package with Active Response 4WD" (Z6E) packages. Obviously, no Duramax MY2025 exist in the wild, so I can't really verify with Window Stickers, as I did above.
However, please see attachment regarding configurator changes when I try to add Z6E package to a Duramax MY2025 with PCN. In other words, it removes Duramax and PCN, and replaces with 6.2L.
I'd welcome any thoughts,
@AMWWORKS /
@WalleyeMikeIII , as to how one might configure MY2025 Duramax with PCN & Z6E. Thanks so much!