Too bad I did not saw this thread before
I confirm all info provided by Ta
IThe C-47 licence was bought in 1935. Some of them had dorsal turrets, some other did not.
The Japanese version was also licensed to the before the war.
Through the war, the LW pilots often misidentified soviet airplanes, and although the Li-2 was sometimes used as a bomber or even a night bomber, it is very unlikely that they were used as night bombers as late 1944-45.
At the time, the main Soviet twin engined bombers, that could be used as level bombers, were the DB-3, an orginal design put to production in 1936, the Pe-2, and the Tu-2 / Pe-2 and Tu-2 were not night bombers under normal circimstances
At this time, the Sb-2 had been pulled back from front line.
So it leaves the Db-3 as the most probable, the F version being renamed in Il-4 after its designer name (Ilyushin)
After the twin engined Db-3 and Sb-2 had been slaughtered en masse in their attemps to slow down German advance during the 1st few weeks of the war, the VVS decided that they would be only used at night, against operational, but also political targets such as Berlin.
So unless very specific operations, the Il-4 was only operated at night.
My conclusion : if they were night bmbers, they were Il-4, if they were transport/supply planes( which aslo were mostly operated at night by the VVS to avoid interception) they could have been Li-2s