The two kits really differ in that the Ark Royal kit has the deck edge elevator and a different radar suite. That suggests "before decommisioning" while the Eagle kit does not have that arrangement. Also the Eagle kit has additional AA in the bay where the elevator is positioned on the Ark Royal which suggests an "early on". Both were commissioned in the 1950's and served until the late 1970's. All that being said both kits contain identical sprues which have the small parts I am looking for.