I disagree about RLM 74 and 75 being used before 1941. The combination was not specified by RLM before early 1941 and was introduced into the production process in April of the year.
During the BoB a number of Zerstörer units still used aircraft with the standard 1939 camouflage pattern (RLM 70/71 over RLM 65 with low demarcation line - as you said) while new aircraft were already painted in the 1940 standard camouflage pattern (RLM 71/02 over RLM 65 with high demarcation line and fuselage mottling). Any other "grey" schemes were most probably mixed from whatever was available - JG 26 is a prime example for this practice.
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