Yes all is the same, GPU driver and OS.
Of course when I booted the PC, windows noticed that the MB and CPU are different so some driver updated it (like PCI).
With the old PC I started having problems with 1909 and 2004, then 21H1 was fine.
I honestly thought I could be safe by keeping the same GPU, monitor and software but apparently something is not working as it should.
With the microscope and 240FPS recording I see no difference in pixels between the two PCs.