I don't know about the Japanese question, but certainly there would have been numerous battles between the Bf110 and the P38.
I will have a look and see if there is any info on the general outcome of these battles. But the two planes are ostensibly a fighter (P38) and a Fighter/Bomber (Bf110). So, in a dogfight situation I certainly would rather be in the P38. In my opinion, a far superior 'interceptor' and 'pursuit' aircraft. Although the Germans did use the 110 as an 'escort'.
Both American and British pilots flew P38's as frontline fighters in Europe and Nth Africa, at times, so there should be at least some info around.
I'll check. ;D
