I just want to know if it's possible or will it works...

I have 2 system, with Windows 10 installed and activated (bought the system preinstalled and activated).

If I want to switch the disk between the 2 devices, can I create Backup Window Image of the two system, swap the disk, and restore back the image?

Yes you can restore.

But what is objective? To spoof the license? This no, locked to cpu/mobo serial.

That's why I want ask..
because I need to swap the windows between the two systems.

Original Disk 1 in System 1, Disk 2 in System 2

Swap to Disk 1 in System 2, Disk 2 in System 1

I worry if I don't restore Windows on those disk, Windows will check the system, and it'll be no longer valid

Shouldnt be a prblm if both have uefi/legacy system.