News Microsoft will charge Windows 10 users $30 per year for security updates

[setx]

I suppose at a high level it all looks the same, but scheduling different cores isn't as easy as a toggle switch to turn it on or off.

No one said that that Win10 and Win11 uses the same scheduler.
But minor scheduler tweaks does not warrant calling the kernel "completely different". Even the very significant changes of NT5 -> NT6 kernels wouldn't be called that.