Steve, you caught me. Yes, I meant the 70/71 scheme, not 71/72. My apologies to all.
The picture of R4+EN in Boiten's book to which I referred carries the caption "...BF110F-4 R4+EN at Leeuwarden airfield in the summer of 1942. Note the early wartime camouflage pattern on the 110..."
I too questioned this but the B&W photo unquestionably shows two tones. Of course, it's possible that it's a field application of available colours.
I would suggest (not having seen the photo, though I have Boiten's book somewhere) that the two camouflage colours might be 74 and 75. The pattern of the splinter scheme, and the reference points needed to apply it, didn't immediately change with the introduction of the new colours.
Cheers
Steve