Both nVidia and AMD optimize the drivers differently between "Workstation" and "Gaming." I would expect that Apple leans more towards 'Workstation' tuning in this context, than 'Gaming.'
I doubt it. "Workstation" drivers traditionally are about supporting a subset of obscure features that legacy pro applications used (like high-performance flexible wireframe rendering etc.) as well as stability (less cutting edge features, strict conformance testing). None of this applies to Apple Silicon side, as Apple does not differentiate between prosumer and consumer in software. On the hardware side, Apple GPUs are more gaming than traditional "workstation" — no FP64, no fancy line drawing, no legacy API support. It's just that unified memory and the overall compute-oriented architecture is also very good for the professional workflows. And what's even more interesting, many of the traditional "gaming" features can be utilised for professional workflows, in fact, it is Apple's official recommendation that image editing applications use the "gaming" rendering pipeline and make use of texture mapping hardware and tile shaders, as they make it easier to utilise the hardware more efficiently.