McLaren and Mercedes seem to have swapped aero paths.
McLaren introduced a new sidepod shape in Baku, similar to Mercedes. The shape was then change on the Mercedes to something more similar to the original McLaren.
Mercedes ran most of the season with the nose/front wing connected on the second element, leaving only the upper element as part of the SM-mode. That front wing was changed to mount on the first element, moving both the two wing flags in SM-mode. McLaren went the other way.
Very very interesting.