I suspect the vent thing being a installer error at the factory. Parts like these are installed by hand by someone and since there is such a wide variety of F10 models being built on the same assembly line someone f'ed up is my guess. I see no reason why those two nearly identical cars would have two different arrangements. Given the LCI's have new LED foglights and trim around the bumper maybe someone installed the wrong part for these early builds or they forgot to remove the blocking cover meant for different F10 engines that doesn't have coolers on each side.
Good thing is that those grills pulls straight out so someone with one side closed off could check if they can pull it out and remove the plate that is covering that side easily.
So to all the LCI conspiracy theorist here yes this also makes the pre lci that much better on top of the suspension
Next up..."Better soundproofing doors in the LCI is making the car too quiet and less sporty...."