Hi Vladimir.
It's hard to have certainty of facts.
We've seen opinions for 3 colours, blue gray, Bavarian blue, green and i'll add another as its stated in Osprey AOA 71... black (as possible). Pfalz 8170 was part of the penult batch of D.IIIa's orders in Jan 1918 that had the serials 8000-8339/17 (Datafile 21).
Getting back to Gregs book from Osprey it is said that a number of aicraft from the final two batches of D.IIIa were covered in five colour camo on the wings and control surfaces being the 8170 one of them. I'm not saying that they were or weren't, just what is written, but i do agrre with BlowHard... evidance can't be seen at least in those pics.
My opinion and being the subject the 8170 Pfalz only, is that when watching DSA scheme we can see two things that are diferent from the real pics: the cover of the wheels are of diferent colours and the rudder matches the colour of the aicraft.
Although Greg is saying that the dark colour does not comply with the usual light shade of Bavarian blue, thus assuming the black colour as Bavarian Staffeln 13, 23 and 32 used for a while, if we take a closer look to the pic where Ltn. Hans is posing with his machine it is possible for us to compare the tiny bit of black just visible from the Balkenkreuz with the colour of the fuselage making the last one somewhat a lighter tone.
So i guess that Ronny just went with the best he could have from the data collected imho, and if it was me i would go with the lozenge wings and the bavarian blue just like Ronny did (but again, this is me).
Whatever the scheme that you decide to paint... no one can prove you wrong.
Cheers