A few mistakes in your pictures. On the bottom pic, both images are from Silverstone, as both cars have the new vain under the sidepod intake and on top of it. On the upper picture, Williams stopped using the suspension that it is stated to be from Austria allready in Canada. But, nice catch, the susspension in Silverstone was indeed diffirent in the race, I have missed that. Chacking the pictures, Kubica did test the new suspension on friday, and probably didn't like it so he went back to the old one. Here is a picture from friday, car #88 with the new susspension.
I wonder what did they change, the rubber shroud looks so bulky now, and maybe the upper wishbone is attached to the wheel a bit further back?