Hi Steph,
I'm yet to see a good photograph of Dickfeld's FW 190 A-4, and I'm not sure what photograph/s those colour profiles are based on. There is a photo of Dickfeld's FW 190 in Jochen Prien et al.,
Jagdfliegerverbände 11/I, after Dickfeld had written it off on 8 January 1943, but it's hard to make out much detail. The photo does confirm that the fuselage cross had a thin black outline, and there is no sign of a II.
Gruppe horizontal bar on the white fuselage band. RLM 74/75/76 seems a much more likely paint scheme, given that the aircraft was only based in 'desert' country for a few days before it was written off. A desert tan camouflage scheme was of little use when the unit was based in northern Tunisia in November/December 1942.
I'd like to see evidence for the Osprey book statement that most of the North African FW 190 A-4s were repainted in desert tan schemes, because the available photographs seem to suggest otherwise. In our
Focke-Wulf 190 in North Africa book, Morten and I wrote:
"While it is often believed that aircraft based in North Africa were painted in desert colours, this was rarely the case for Fw 190s. Most Fw 190s operating in Tunisia retained the standard European scheme of RLM 74/75/76, although there were exceptions. RLM 78/79/80 was the 'tropical' scheme used in Tunisia, and it appeared on some II./JG 2, III./ZG 2, and III./SKG 10 Fw 190s. A photograph in Chapter 3 of this book reveals a III./ZG 2 Fw 190 with the scheme applied before arriving in Tunisia. II./Sch.G.2 arrived late in the campaign, and its aircraft were not repainted, retaining RLM 74/75/76."
Sorry that the above doesn't really help much with your question, but there is minimal photographic evidence for this aircraft, and in my humble opinion those profiles are really just speculation.
Cheers,
Andrew A.