I'm working on a TL where Hitler and the Nazis were not so stupid when it came to helping their allies with heavy weapons. So in 1942 for example the Finn's, Hungarians, Italians and Romanians start to manufacture the PzKw IIIM/N instead of things like the 40M Turan or M14/41. The PzKw III in late 1942 could still deal with the American M4 or British Crusader. As time progresses the need for AA tanks increases so a PzKw III with it's turret replaced with a turret of the Wirbelwind AA tank is produced. The Kleine Wirbelwind. Other weapons and what happens will soon follow.