Mintmaster
Veteran
That Motorola link was just for your convenience. The table and info is pulled from MS documentation:All you have shown us is the "driver model" quote from Motorola. That does not mean that the drivers are ABI or even API compatible. But it is probably pretty easy to port them from WP8 to W8 and vice versa.
http://go.microsoft.com/fwlink/?LinkId=303992
http://www.cl.cam.ac.uk/~acr31/p36/WP8 Development Cambridge.pdf
For someone developing an app, some APIs are a bit different, but core APIs are the same, and for hardware vendors low level drivers are the same.