I am beginning to have this feeling that AMD is giving both Sony and MS the exact same chip. And the differences will come down t how each company clocks it (aka cools it), amount of RAM, SSD solution....etc.
Given the very same limited set of Lego they have to work with, and very well-defined goals (release date, price, value, power envelope, thermals, etc) , there isn't really much they can do. Barring some concessions to account for some kind of specific focus (e.g. if one of them decides they need to have a 512bit memory interface because reasons, for instance), they'll look very similar. Very, very similar.