Yes. it looks like. Also here gathered a couple of clipped pics with the tops of the leading edges for Emil seen. Two of them are of the dark tone and one of lighter one. All pics taken in full sunlight. These shots show that the recess for the slat was of different colour though. But you are right that it could be afforded in early days.
Anyway it seems that the colour there could be the RLM 02 rather
There is one more nice image of the slot area of an Emil. But I couldn't find the images via the net. It should be on my old HDD but unfortunately it is still in hardware service waiting for becoming an USB drive. If I find that I'll attache the shot there.