For those that are sensitive to stupid details: Be aware that these are reproductions, where the left and right are identical (non-handed as it's called).
Originals are left and right unique parts, a LH and a RH part exists.
The differences are that when installed, the ends near the wheels follow the wheelarches nicely in the BMW trim parts. As the front and rear wheelarch have a different curve, so do the ends of the bmw trims.
In the walloth part the front and rear ends of the trim are cut identical (symetrical) thus they do not follow the curve of the wheelarch exactly.
Still it's good that Walloth makes them, as BMW don't anymore...