So both are using a variant of Navi, but not Navi itself, since while the consoles will have hardware based ray tracing, Navi doesn't offer that. They may both be doing what PS did with Pro. Using the existing arch (Polaris/Navi) and baking in some of the features of the upcoming newest up to date arch (Vega/"Next Gen"). Either that, or AMD may have called the "Next Gen" arch that, for that very reason. It's the 2020 arch and is what's going into next gen consoles perhaps.
What's funny about this thread now, is that it's not just are they using the same GPU, it's are they using the same everything? While we've only been given the most basic details for the main components, both consoles sound remarkably similar, they are both working with AMD, and are likely to both launch holiday 2020. While XB1 and PS4 had similarities, these two may almost be twins. If I had to bet, I would guess the main difference if there is one, would be the GPU performance, and that PS may go with a slightly weaker GPU to be able to sell $100 below Anaconda. Which would mean a $399-$499 PS5, and a $499-$599 Anaconda.
