Mmmmmm, The 219 - this is something I know about
The upper camo is definitely a base of RLM75 with an overspray of RLM76 or Green-Blue (RLM84* as some ppl call it) - there is so much variation in the RLM76 colour by this stage of the war, that at least 4 distinct variants are known of (including the Green-Blue version we see on the NASM machine).
Undersurface camouflages are also a bit mysterious - It appears a large portion (or all?) Rostock blocks 4 and 5 aircraft were rolled out of the factory with the RLM22 undersurfaces; people will cite exceptions/counter-examples to this, but these things didnt not stay pristine for long (ie: a/c suffered crashes on landing or take or, etc; so parts were salvaged and re-used, new parts were fitted, whatever they needed to do - there are at least three plain to see examples of this, if not more!)
Early Rostock A-2's with the RLM76 lower also seem to pop up quite often with right hand lower wing surface in black - these earlier one have a classic 'white outline' Balkenkruz on the black (and Black on the Grey wing), while later aircraft and repairs have just the late war solid cross (like we see on the Fw 190D and etc) in white on a black wing, and solid black on the grey side.
Rostock mottles were also very different from Schwechat mottles - the Schwechat pattern was much more feathered and wavy (also look thinner), while the Rostock pattern was significantly less feathered and denser in colour - as it evolved, it noticably changed shapes; so an early 290- will have lots of circles, later 290- will have intersecting waves, with the mid 310- series will have waves and arc's, joined by smaller curves and squiggles. The lack of clear definition of the Schwechat pattern makes these conclusions harder to apply to these machines.
Replacement parts from the factory share these idiosyncrasies, while repairs from Cheb - well, that's a whole other ball-game (ie, you may have A-0 tails on what appears to be an A-2 fuselage, with A-7 Nacelles and Fuel Systems (possibly wings). And the camo will be patched up in places)...
Then there is a number of a/c which received upgrades, and a number which received unit-level additional camo, ranging from splotches of probably RLM74 or 75 on the uppers, through to large scale applications of what maybe greens or browns.
Moral of the story really is, pick a WNr before you start. Your wing intakes will be different, antennae fit maybe different, camo pattern will be different, etc. If you have a WNr (or a tactical code) in mind, let me know... I'll look and see what I have in the Database!
D