The Mueller report was looking for violations of Federal Law to be clear. In this case, the NYC DA I would think is staying within the framework of NY State law. Regardless of what people outside NY think (I live in the South btw), this is a state/local matter. So I in now way would think the NYC DA is going to have in his indictment any ties to violation of Federal election laws, if so, that is overreach and could get the entire case thrown out.
According to news accounts, the NYC DA has admitted he commingled federal and state funds to indict Trump.