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#11
I was just doing something similar. A friend of mine brought his HDD with W10 on it and it booted on my completely dissimilar computer, took a while to boot up but it did boot and after a while it even installed proper drivers. If you can make sure computer is connected to internet by wired connection.
Not sure how you can deactivate a digital license in Windows 10. I tried to but it didn't seem to actually do anything. I think this advice is from a previous licensing model.
Yes it is absolutely fine. Some server installations of Windows will invalidate the license by changing disks (as that is how it is licensed) but retail versions never do. Feel free to swap as much as you want - I do it several times a day sometimes switching between VM and native boot.
I considered my doubt solved if I can simply shift the SSD1 with the Win10 installation to the new PC.
About the Linux installation on the second disk this will follow his guided installation.