I found the following website with a list of A-2 Werknummern:
http://fw190.hobbyvista.com/a-2a.htm
Wk.Nr. 0120222 is also mentioned. According to this list, it was an A-2. But it might be that the Wk.Nr. of DN-CB was not 0120222 although it would have made sense considering that DN+CC was 0120223.
Regards,
Roger Gaemperle