When you mentioned Warship Models from Fleischmann and Märklin from the 1960s, I first expected they took just a german V200 and just painted them green, red or blue...
When my Uncle saw the first time a Picture of an A3 with Smoke Deflectors in one of my british Railway Books, his first Comment was "looks like the Englanders copied our Post War Smoke Deflectors!"
Fun Fact: He's born in 1963!