I remember when the league went to the synthetic balls during the Nash years. I can't recall what season but it was a league wide issue where players regularly complained and they switched back by the All-Star break, if not sooner, because shooting was down and turnovers were up a measurable amount. Having hard data to back up the complaints helped and anyone who felt one of the synthetic balls could feel the difference immediately. It didn't have the same bounce as the leather balls and the grip was different. I can't remember if it was stickier or slicker but it didn't feel right.
Changing brand shouldn't cause the same issues though, at least not for an extended period. Players should get accustomed quickly, if they aren't already. As noted, players use all sorts of brands in practice. It's not nearly as drastic as changing the material of it entirely.