On the subject of dissimilar air combat (re: Lightning v Spitfire) wasn't Brazil involved in a war with a neighbour. Brazil had P51's and the neighbour had MiG 21's? The Mustangs all ended up at the CAF in exchange for T33's.
A night fighter Dornier 217 downed a Russian B25 over Germany during a night raid. B25 was on a training flight and lost.
Zero's v Piper Cubs, Pearl Harbour.
Tomcats v Zero's in "Final Countdown".