Weiand Action Plus vs Edelbrock RPM

Uh-oh, I was just thinking. If the difference between the two brands is a couple of hundredths, couldn't you get that same variation with two 'idenntical' weiands or edelbrocks due to casting variations?
Also, not racing on the same day is variable. It was "spitting" rain drops now and then today. Not good air. Wasn't the best with the Action Plus, though, either