Warren is likely going to be a fine player, but he's not Bowers as a prospect. You can just see it in the way they move before and after contact that Bowers is in a different league in terms of agility, acceleration, and shiftiness. And Bowers is actually younger, too.
I don't buy this narrative that Warren is a "one year wonder" though. He obviously had a huge year this year (one of the best ever for a college TE really), but last year he had 422 yards and 7 TDs, which is pretty solid for a college TE and was 1st in TDs and 2nd in yards and catches on that Penn State team.