I think these are Ki-36 army co-operation aircraft, there were subtle differences between the Ki-36 and Ki-55, the latter had the lower portions of the spats removed and the little window on the fuselage side below the rear sliding windscreen, barely noticeable in the image, but it's there, was absent in the Ki-55 (I researched the type when looking for information on this aeroplane preserved in China).
Original un published can-did snap shot of an Imperial Japanese Military Zero fighter aircraft on a pacific island during World World II. Up for your consideration is an original World War II U.S. Military photograph snap shot.
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