Of additional note any Continuation War event will be helped by the fact we have 109G2s and G6s in the game. These were important aircraft for the FAF during '43 to '45, "and probably beyond". Bringing in the LAGG-3 would kill two birds with one stone because the FAF operated a small number of captured ones, "I forget how many and hate google", and it was a very common adversary for the B-239s. The later models of LAGG-3s were probably worthwhile and "game quality". The FAF also flew a small number of Hurris, both 1s and 2s.
Its going to be interesting to see exactly what Brewster we get, and how "exactly" they are outfitted.
To be totally, historically accurate they have to be the 239s. The A-1's with the Wright R-1820s, "refurbished DC-3" engines, that were re-assembled in Sweden with the CV gear stripped, the armor stripped, and sights supplied by the Finns. I suspect the 4'th 0.50 would be included, and pilot armor, since all of the Buffs got this upgrade, "as far as I know".
As far as performance, rate of climb, fire power, bomb load, were talking an airplane in the FM-2 range. The 239s were lighter and climbed better, maybe turning a bit better the the later A-3s the USN and Brits later got.