Yeah, mirrors my experience with similar parameters(CachyOS, Zen3, RDNA2). On average games seem to run more or less the same and maybe even slightly better. But so far it only really mattered in like two cases where i slightly missed the performance target on windows and the 5-15% performance uplift on Cachy were actually noticeable.
IMHO the main takeaway shouldnt be to switch to Linux because of better performance. Like 8-9% more performance on average for free is nice(atleast with this specific testing scenario). But its hardly noticable in most cases. I would rather focus on driving the point home that if you want to switch to Linux anyway you dont have to worry about performance regressions atleast with an AMD gpu.
Otherwise i feel like CPU bound games seem to profit the most. IDK if its just less overhead, better scheduling or what. I'm barely knowledgable enough to just spit out dangerous half-truths.