4/6/8 have all been mobile/APU versions of the previous gen fwiw. They changed that up some with the 7000 series and their naming scheme as the 4x indicated Zen 4 (as you likely know). I think (could be wrong) 8000 will indicate Zen 4 by default.
Additionally, technically the 7950x3d is an APU lol. AMD isn’t helping with the schema