Talk:MSZ-006 Zeta Gundam

Three phases of the Zeta Gundam
So I came across the Master archive mobile suits MSZ-006 Z Gundam and it said that the Gundam has passed through three stages in Gryps War, just as the Wiki says.

However, can anyone point out to me the changes between the Mid Model and the Late Model? Hard as I tried, I still can't spot any part from the Zeta Plus.