Aeon will remember everything, but personality wise was not much different so it's all good. Also so I can make hilarious comments towards Watanuki.
Zero is going to repress more things so it's more dream-like, recalling the bigger events, but forgetting more of the personal interactions with others. Burying them in his subconscious cause it's not really 'him'. If pressed about it, may recall certain bits and pieces.