It definitely gets fuzzy. While the CPU family is the same, the overall system architecture is very different. For starters, the PS4 "south bridge" is almost an embedded system in its own right. It's also debatable to what extent shader translation overlaps with "emulation", because there are several different vendor/stack-specific notions of IRs and "precompiled" shaders that don't necessarily map well to the ISA vs. implementation distinctions that exist on CPUs.