Gabor,
B R I L L I A N T.
For the Yak claimed on 25.2.45, I found this info a long while back that might help you:
This was most likely Romanian Bf109G W.Nr. 166248/"Yellow 9" of Grupul 9. Adj. Stag Av. Traian Darjan KIA
Source:
http://www.elknet.pl/acestory/darian/darian.htm
Are you able to provide the serial numbers of the Bostons claimed on 8th January, 1945
Nick