I don’t have first hands experience for exactly YOUR scenario. In the past i bought a Linux Laptop and i created a backup (from my PC) from the Home Partition. I installed Manjaro and installed also all Program’s and executed them all 1by1 (to create config files, because otherwise i was running into bugs)… I also created a Timeshift snapshot (if something goes wrong).
Then i switched to Life Environment (usb bootstick) and replaced my User Profile which had exactly the same nickname as the User Profile from my PC and overwrite everything.
Get sure the Userrights fits to your account, after that i could use my Linux Laptop with my duplicated User Account!
But if you don’t reinstall, from my understand you need to watch out, if you used Process Governor for OC… get sure its changed to default settings.
Is it possible that the UUID’s changed when switching SATA/NVMe Ports because of new MB?
If this is the case, then i guess you may need to edit fstab/grub to adjust the new UUID’s.
All driver’s in the Kernel yeah, but what about his RAM? Isn’t there some allocation’s somewhere that need’s to adjusted that the system will get used 32Gbyte instead the 16Gbyte?