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.