You cherry picked a terrible example. Here are some more Windows examples with the same chip:
https://browser.geekbench.com/v5/cpu/2628613
https://browser.geekbench.com/v5/cpu/2628613
In my own personal experience, running Geekbench on many machines, Geekbench scores are pretty close running between Windows and Linux on the same machine. At least for compiling code (my main use for powerful machines), their compilation benchmark numbers also fairly closely match compilation times I observe.
Linux: https://browser.geekbench.com/v5/cpu/2638097 Windows: https://browser.geekbench.com/v5/cpu/2635048
Geekbench is a terrible benchmark.