Haven't seen a overhead comparison of the SF90 & SF1000 so I made one:
Some very apparent things: the top of the sidepods have been closed, mirror-stalks have been upgraded & moved inboard, and a new front-suspension element is visible.
It's about 75% the same as what we've seen in the final race at Abu Dhabi, the fins closest to the floor are all the same. The change in the double boomerang is the most apparent.
Not an exact match in camera angles but the new mirror-"stalks" are much more visible here. The leading bargeboard elements closest to the chassis are, as most people observed, much more taller but they are located much farther back than before. The leading elements on the SF90 were shorter but they were almost touching the wishbones.