Without really being able to contribute in this particular case I would still like to share my experience when pulling out parts of a Heinkel 111 from marshy water at Andøya in Northern Norway. IIRC the plane crashed some time in 1940. The colours were still very crisp and when inspecting the parts, including some pieces of canvas, I found definite proof of what the general consensus is regarding the colours 70/71 and 65. The Black Green was very dark green, the Dunkelgrun was lighter but not a lot and then the Hellblau was - well - a light blue. I'd say that the Polly S colours are pretty much bang on.
Unfortunately I didn't take any pics and I put the parts back in the tarn. I know where it is though
Kyrre