To have the same voice he would need the same voice actor. I thought that was obvious?I answered the question on the thread title.
Didn't realise we were talking about voice actor >_>
If that's the case voice actor should stay the same, but she won't give him the same voice.
Voice actors are payed to do a variety of different characters, if she can't pull this off and give him a lower tone I would be surprised.
IMO same voice actor with a slightly rougher/deeper voice