I have a strong feeling the front end will be different. Comparing the kidney's to the F30's kidneys and the F30 spyshots before it was unveiled, the kidneys on the F80 seem to have a flatter top and be slightly wider. I do not think I am just visualizing that because there are more slats in the kidneys of the F80 than the F30. I actually think they are wider.
In theory the front end HAS to be different so to accomodate the wider front fenders.