Current consensus appears to be that Emil cockpits were RLM 02, with the instrument panel in RLM 66. By late 1940 - early 1941, cockpits were being entirely painted in the darker grey.
Also a note about the angular E-4 canopy, these were supplied painted RLM 66 inside and out. Once delivered to units, the exterior of the frame was usually painted to match the aircraft. Some photo examptles do show a dark exterior frame, so likely a field replacement or just not bothered to be repainted.
regards,
Jack