I agree my friend. However, from memory, the Gardermoen machine was restored to how it had looked, after being recovered from a lake, where it sank in 1940, and I have seen 1940 to early 1941 period pics, where the cockpit tone certainly suggests the darker colour, rather than RLM 02.
Likewise, the JU-88 that Guttorm is involved with, is also mainly in the darker grey in the cockpit, although period pics of, for example, the Do-17 are definitely in RLM 02.