I put 3 5-blade innerloc and 3 muzzy 4-blade heads in my quiver. I practice with both, and they all impact the same exact spot at 30 yards (my limit with whitetails).
They started giving me grief over it,, saying you cant do that!! they wont fly the same as each other.
I think that a bunch of bull, especially since you have proven to yourself that they do.