Euhm... you should REALLY reinstall when changing to a DIFFERENT TYPE mobo. Chances are, if you are lucky, you will be able to boot into windows. But even then you should better reinstall as windows will make a mess with drivers.
anyway TS is not changing mobo, but CPU. Not even said if its a different type. As long as its same 'family' and same number of cores he should be fine without reinstalling anything.
auto activation will likely give issues when he would reinstall later on, but you should be able to activate by phone.
short answer: NO 😉