I believe he would then be a clone trooper not a storm trooper, I think that is one of the main differences but I could be wrong so don't quote me on it.
Well the 501st legion was Fett clone pure legion led by Darth Vader during the Galactic Empire era. And many of the Storm Troopers right when the Republic was formed into the Empire were Fett clones. Also most storm troopers were flash trained and were from many different genetic templates, and they preferred to just storm in and shoot aimlessly compared to them. They were cheaper to make and maintain so the Empire began to use them along with some humans and some aliens. And the armor didn’t help much ether. Thats why most storm troopers were shitty shots.
have you ever fired a gun under stress of combat regardless of if its a plasma based weapon or bullet cause its harder than it looks to hit a moving target.