I won't doubt anything that Buddies says, but that seems a little unlikely.
If surface was the only difference, why would they need to get USBC approval for 2 different balls? That's twice as many balls to submit for testing than is really needed. Seems to me that USBC takes all balls submitted for approval down to a specified grit before they do whatever testing they need to do.
Unless this is to simplify things for the factory and warehouse workers.
Think about it - it would be like Hammer getting approval for a Black Widow at 2000 grit, and another approval for one at 4000 grit.
