I'm always a little suspicious of modern warbird schemes, models, or profiles for that matter. The standard VVS scheme was for no stars above the wings, but there were exceptions.
I've had a look through my books and on the few photos of Lend Lease aircraft that show the top of the wingtips and there are no stars, just painted out Western insignia. But thats half a dozen photos and only one of a P-39, so not really a representative sample. Cit's default scheme was of a plane dragged out of a lake recently and this had no stars above the wings.
So I don't know if your Airacobras had stars above the wings or not, but my guess would be probably not.