It looks like to me someone has already substituted the original screws for those. They are not the same. You should have the hex washer type b screw like on our cars. They are all over mine, so unless BMW decided to change up screws on the underside apron someone did that for you.
In any case more than likely the body of the screws are the same size, our screws just look bigger because of the head and washer combination.
EOS.
