What I would do, since your changing so many parts, is keep windows on the hdd, and plug it into the new system and let windows load up and connect the key with the new Cpu/Mobo, then shutdown and wipe it then install on the ssd.
Jk, if it is a retail key you will be fine. just put the new key in when installing on the ssd if it asks, if not when your done booting.