Strange, as Herbert Rogowski is buried in same cemetery, death date 3 August 1944 (search
http://www.volksbund.de)
Death place noted by Volksbund = Beaumenil for Rogowski, Bernay for Nitschke. Beaumenil should be a Germanized form of Beaumesnil, some km SE of Bernay.
One possibility is that Rogowski bailed out and so died some distance of the crashplace, where gendarmes found the rest of the crew. Another is that Rogowski died at crashplace and Nitschke was one of the wounded and died after being carried to the nearby town, Bernay.
http://www.maplandia.com/france/haut...ay/beaumesnil/
Regarding your query, in this format KIA will be the fate of the pilot, "due to Flak and enemy fighters" will be the cause of loss of the aircraft, and so of the death of the pilot too.
Bonne journée
Laurent