Your first point is absolutely misleading. You can apply the same logic to the other cars saying that they are all different because of the different tyres, the

Your first point is absolutely misleading. You can apply the same logic to the other cars saying that they are all different because of the different tyres, the different conditions of the tyres, of the brakes, the different degree of care and so on. You can’t just say that they are not the same cars because of the different variables.