The Ar 234B-2 coded F1+AD belonged to the Stab III./KG76. That means the "A" letter was of the green colour and might have been repeated under the cockpit. She was flown by Mjr. Hansgeorg Bätcher who was the commander of the III./KG76. IIRC the serial of the plane isn't known.
As far as I know, these colors were used by the Luftwaffe until the summer of 1944. Here... And here the question immediately arises: were the ar-234 b-2 t9+KH painted in the old colors? After all, Sommer brought the T9+KH to the unit on October 14-30.