A closer inspection of the opposite side shows very little in fragmentation damage from the first two, a conventional HEF round like the Hispano or Flak 38 would show a shotgun pattern of larger fragments directly opposite the impact points rather than the dust effect we see so the third hit could be the heavier frag round with tracer, the M-geschoss round had little steel left to produce fragments, although I don't recall the belting used in 1940.
I see there are two impacts on the wing root which could be 7.9mm.