There may some confusions in russian documents because many A-20s were modified in soviet service, notably to reinstall a glazed navigator position in versions which didn't have one (using among others glass panels from Il-4s).
Others were provided with a soviet-made radar,...
That may explain the "appearance" of new subtypes in soviet service.
Hope this can help,
Kolya.
P.S. : I think that on this webpages, the second A-20 photograph depicts such a modified airplane.
http://lend-lease.airforce.ru/englis...ikov/index.htm