In the English dub, of Dragon Ball Xenoverse 2 at least, Goku Black and Goku have the same voice actor as well (Sean Schemmel), but Goku Black’s voice is a bit sinister.
Listen to all of Goku Black’s quotes in Dragon Ball Xenoverse 2 below thanks to SaiyanGamer.
Dragon Ball Xenoverse 2 is an action-fighting game with MMO and RPG elements in development by Dimps.
In fact, both Goku Black and Goku sound exactly the same in the Japanese dub.