Hi Paul, I believe that the aircraft retained it's original A-1 data plate when upgraded but also had a new data plate attached also at a different position but with new A-5 details (dates). Keeping same WNr. I suppose it just depends what plate they found first? Clearly its an A-5 but many Ju88's were coming down at this time mostly reported as A-1's whilst the upgrading process for the type was well underway. Not much help in determining which version these actually were unless like here we are very kindly furnished with a photo. My knowledge is limited on this matter perhaps Ed North could confirm?
