Not sure, but I think Toyota did their best to try to get the power to weight ratio as close as possible but that 200kg (400lbs) approx extra weight has to impact the way it handles.
I think it will have the same outright grip, maybe more if it has more width that gr. But it just can't have the same braking Performance or change direction as fast as the lighter nimbler gr yaris. I think acceleration might be same.
