Board Thread:DC Universe Discussion/@comment-1038387-20150220022658/@comment-1038387-20150226210942

http://www.comicbookresources.com/article/teen-titans-go-producer-revels-in-stupidity-of-young-justice-crossover

That's that question answered: "There are no other voice actors [except Khary] from "Young Justice" making an appearance, but you'll see some of the other characters."