Compatible yes. But only with the 2019 and following models of the Genesis II range.
For the 2017-2018 models the size of the grids is not the same and it is necessary to replace the central grid of the GBS by another one (ref. 66090), so that this plancha "fits" in the space left by the removed side grid.
The advantage of this model is that with the Genesis II > 2019 models, the surface is larger and there is no wasted space or "hole" unlike the old model, the 7650.

Weber finally received and mounted. I put 2 plancha on my 6 fires and I order a 3rd because it passes ;)

I don't know, ordered 15 days ago and only received the plancha and not the Weber to date ;(