You can open the Dogfights made by the QMB and change the individual aircraft on each side.
Run the Mission Editor and open the QMB Dogfight. Click the expand button at top left by the little green squarerepresenting the mission. Each aircraft should be listed for each side. Click on an aircraft and you can change "model" (i.e., aircraft type) and then from the submenu you can change skin and AI rating. I use this to make mixed flight because the Germans often operated mixed formations. You can also change weather, turbulence and wind strength/direction etc (but IIRC, the wind direction is the bearing the wind is blowing to, not from).
The D.III appears in the editor, post-patch. So just make a dogfight with, say D.Vas in, then change them in the editor to D.IIIs.
Cheers,
RD.
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Beyond gliding distance