WholeNutty :
lordmoltke :
Yes, you must. It might be the same brand but some components sure are different.
Even if I keep everything from before? so the ssd already has windows installed and all of my files and folders
Yes, sorry but you'll have to reinstall the OS. Besides, looking at the specs of both MOBOs you mentioned, they are very different, for example; the M5A78L-M/USB3 uses Realtek®, 1 x Gigabit LAN Controller, while 970 PRO GAMING/AURA uses Intel® I211-AT, 1 x Gigabit LAN Controller, M5A78L-M/USB3 audio:
VIA VT1708S 8-Channel High Definition Audio CODEC, 970 PRO GAMING/AURA audio SupremeFX 8-Channel High Definition Audio CODEC and so on.