If the cnc shop ran the same program thru them as what they do for the MW version, and they don’t put any holes in them in the process....... seems like you’d end up with the same thing as if they had started out as MW heads.
Depending on what you’re building, I’d say 1/2 the benefit(maybe more)of going to MW size is using a MW sized manifold.
Especially as the engine gets bigger.