I've seen AP rounds hit, cannon HE rounds hit, and the famous Hurricane vs C.202 clip where the Breda-Safat machine guns which fire HE included shells hit.
When AP rounds hit, it seems they give off a short, small, bright white spark simular to what we have in AH. They are small, and disappear real quick.
When HE cannon shells or the Breda-Safat shells hit, they give off a large explosion with smoke with smoke, it seems.