i don't know if this will help or hinder you, but...
I have two items of reference, both British. Aeroplane monthly (Feb 2003) edition states that the P 40's used by the Japanese were aircraft captured on the Phillipines and Java & seem to have been mostly 'E' models. It is rumoured that some were used to defend Rangoon in March '43. There is a picture of a P 40 in Japanese markings. Although in B&W it seems to be all over olive green. The
'meatballs' have white borders.
The Russian reference comes from Scale aviation modeller international, (feb 02). It shows an ex RAF machine. A tomahawk 11B, the equivalent of a P 40C,
( the difference from a 'B' seems to have been to do with fuel tanks). The aircraft is ex RAF serial AN281 and now carries white 24 behind the star on the left side.
Operated by 154 IAP Red Banner Baltic fleet air force, Leningrad 1942.
Colours are Dark Earth with the RAF dark green overpainted in Russian Dark green, undersides repainted in underside blue. Black spinner, plain stars under wings, non on top, fuselage stars outlined in yellow.
There are two antenna wires from the fin to the fuselage, and a ring & bead sight in front of the cockpit.
I hope at least some of the above helps!
Pete