I see some similarity, but it doesn't go much farther than "Nice and charming guys with similar voices". Gale is certainly more experienced and knowledgeable than Alistair, and he's less likely to whine. He also doesn't have the quiet sadness Alistair does, nor does he have the same desire to shirk responsibility. Gale *wants* to be responsible for his actions, as they're something he did and he's living with the consequences. Beyond basic personality similarities and moral values. Alistair and Gale are really rather different.
