techflame700 :
Sorry for the late response.
How much of a noise / performance difference will it make on a i7 7700K?
Lets say you install them both on the same case in the same location with the same room temps, the 280mm will perform a little better (around 2-4° C cooler) while making less noise.
I think the purpose of the pro versions was to make them quiet, improve internals, while performing similar to their counterparts.
The pros also have longer warranty (5-years) compare to the shorter warranty (2-years) on the non pro unit.