It looks like in June 1941 the I./LG 1 had 30 Ju-88A-4/Trop and the II./LG 1 25 Ju-88A-4/Trop planes at the Eleusis airfield. In May 1942 the Stab LG1 1 Ju-88A-14 and II./LG 1 31 Ju-88A-4 at the Eleusis and I./LG 1 29 Ju-88A-4 at the Iraklion (Heraklion) airfield. It is very likely that the planes at the Heraklion could be the A-4/Trop variant.
That's all I found in a book for Ju-88.
I slightly disagree with these conclusions.
The A-5 was a direct derivate of the A-1. Due to delays in the development of the Jumo211J engine (which was foreseen for the A-4), the Jumo211G had to be used for next version after the A-3. The A-5 had an increased wingspan compared to the A-1 by added wingcaps - which meant that the ailerons now did not extend to the wingtips anymore.
Between the end of operations in France and the preparation for the attacks on Britain the last remaining A-1s were modified to A-5s. So during the famous
Battle of Britain only A-5s were in use - and also the complete LG1 was equipped with A-5s since summer 1940.
Until early summer of 1941 the problems with the Jumo211J were solved, serial production of the A-4 was ramped up in summer 1941 and serial production of the A-5 was stopped end of 1941.
LG1, when it was sent to their missions in Greece, still was equipped with A-5 version. Also the aircraft of LG-1 during the attacks on Crete in May 1941 and the aircraft used during the attacks on the British cruiser
Najad still were reported to be A-5s.
--> it is highly unlikely that in June 1941 A-4s were in service at the Eleusis airfield.
Also other Squadrons of the Luftwaffe during the early days of of "Operation Barbarossa" in Summer 1941 still were equipped with A-5s.
Later only some of the A-5s of LG1 were converted to A-10s (aka A-5trop, i.e. dust filters on the engines and tropical emergency equipment in the life raft hatch on the rear tail of the aircraft). But they all were quickly replaced by A-4s and A-11s (aka A-4trop).
The A-4 hat the same wings as the A-5, so not distinguishable in terms of wingspan and aileron details. The A-4 got pneumatic de-icer boots on the horizontal stabilizers which the A-5 did not have. The stronger engine Jumo211J had much wider prop blades than the A-5. As well visible on some ground pictures, the entry hatch of the A-5 series was a Bola 39 with a single MG15, the A-4 very quickly received the Bola 81Z (MG81Z) after it became apparent that the Bola 39 was too weakly armored for the increased fire power of the latest fighters to give sufficient protection for the Ju88 radio operator. These entry hatches look very different.
Happy to receive your thoughts.
Cheers!
Source: Nowarra, Die Ju88, ISBN 3-87943-579-0