You probably wouldnt notice it being about a half inch shorter. Then again
you could get 285/40's and not really notice that its a half inch taller.
The 285/40 would look better IMO.
I think that will give you the same tire height. I have 17inch rims with 9 inch in front with 275/40/17 and 10 and 1/2 in the rear with a 315/35/17 it makes both tires 24 and some change in diameter.