Yes it is accurate. You have to use it as if you're on the starting color and facing the other colors. For example, Blue to Red is 2 clicks left. Purple to Green is 2 clicks right. For that reason I find it can be easy to accidentally get a click wrong when you're looking it up quickly so I've always used the cheat sheet I linked previously.
Thx- I'll be running EV tonight the first time, and want to understand how this works... the one I've linked works visually better for some reason, I think I'll stick to that