I agree it is not a perfect representation of what would happen, and I am assuming per the OP that the Fw190A-8 starts with the initiative. In any sort of sustained uphill maneuvering the Fw190A-8 will have a major advantage, regardless of their respective fuel loadings.
And yes, when I say go up I definitely mean in a spiral. Don't hand your tush to the A-20G.
I always approach them with respect as I know that some very good sticks like to use them as fighters.