Lars, it is very confusing indeed on the flower parts. The lip part sounds different though if I understand correctly. The spur on A. mooreana is much longer too.
Acoording to Joyce S., the leaves on Aerangis mooreana are "light green and greyish green, smooth and glossy", "the plants are rather similar to those of Aerangis modesta"
My A. mystacidii has the green leaves with some sort of variegated markings (like yours), not nearly as smooth as those on Aerangis modesta. My Aerangis modesta has greyish green/dark green with blueish shine on the surface, "much much thicker" than those on mystacidii, very glossy/waxy.