On Betayga v Q7, certainly looks like A, B pillars identical and that glass in both front and rear doors  appears identical, albeit there are obvious differences in rear sidelight treatment. Also seems that the Wheel base seems same. Bentley  is wider but that is prob more track and wheel arches. And Bent is longer which is in the over hangs. All of which I find slightly strange actually as I had thought that the point of the modular structure was that one could actually vary wheel base, length and width, etc, but they don't seem to be doing it. Let's see re Cayenne, hopefully it comes out slightly smaller than the Q7....