Yes I believe the actual shield is the same, as you said the spoiler is different. As for how high I raise the screen, its either all the way up, half way or down depending on the conditions in terms of ambient temperature, weather/rain. I like some air flowing to cool as in QLD, AUSTRALIA in summer its usually 30c to 40 c temperatures and in the winter months usually 20c to 27c .
With the screen right up the air flow basically hits the to of my helmet, if I duck down a few inches there is no noise or air flow to the helmet, I am 6ft 2 inches tall, so if you are shorter than that I would suggest that with the screen right up you will have very little noise or air flow to the top of your helmet.