if we make a system image backup from one PC and apply it on another PC, the second one will boot in the same state as the first one, everything will be completely the same without any difference.

Well, that assuming both PCs share the very same MoBo and identical components. Therefore, functioning completely the same without any difference won't be immediately. Maybe, just maybe, after download & install the specific drivers on the new 'corpse' is when that second PC could boot without issues. Jajajaja

Some people might argue about the clone not being the same, but honestly I don’t think anyone could give a rational reason explaining why, because they will literally be the same, no difference whatsoever.

It's obvious for me that when the I/O subsystem is not or will not be identical to the previous one where it came from, this certainly will generate a ton of conflicts. };)