I agree, in fact before doing the MoBo swap I did a little reading on the net and I found some users on various forums that got good results with Win 10 by just making the hardware change without changing drivers or redeploying (some of them simply UN-installed SATA-AHCI Intel drivers before), but nonetheless, I prepared my self for the worst scenario, fortunately the process was painless, but not so re-activating Windows 10 which turned out to be a torture: it was a long and very complicated live chat with an Indian Microsoft on line technician (he/she did not even understand very well English) who "took remote control of my computer
" messing with my OS installation to the point that I had to restore a previously created image!!! ...he (or she), ruined my windows installation to the point, that after a couple of hours, he gave up and wanted me, to install Windows 10 from scratch defying completely my original intention to keep everything UNTOUCHED (the only reason for me, to use Macrium redeploy).
After I finished the chat, sweating in terror just by the idea of reinstalling Windows 10 from scratch and reinstalling ALL my programs, I restored the most recent Macrium image (with all the new drivers already in place) and I tried to figure out by myself how to re-activate my Windows copy.
Originally I upgraded for free from a Windows 7 Home installation which I bought from a retail computer store in its box, so I copied and pasted the original windows 7 key
into the Update & Security>Activation>Change Product Key
option and voila, it got activated instantly.