These cars are a brand new company
As far as the tailights are concerned the single element square tails were common on the early 427 bodies, the later 427 bodies before Shelby ended 427 production and sales featured the dual element round tails. Both are correct for different points in 427 production in the sixties.
I am confident after photographing and holding all three in my hands that the Shelby Car is moild is most similar to the Kyosho in overall shape. I think overall detail is the Kyosho's strong suit, but I think the Shelby has a better body and stance than the rest!