He is voiced by same person, and that face mask would explain a shot...
I had a somesort of topic on a MW2 Thread @ T.Ru
My opinion is folllowing:
Captain Price COULD survive because:
1) It was quite unconfirmed if he was dead or not.
2) He could've get a fake-death (When the heart stopps for a moment)
And GAZ would not survive.....Or, you think, a man can survive a shot with a Deagle through the head, damaging brain and etc...?