Yes I had, but thanks all the same Roman
I have been reading up on my spare time and have found a possibility, probably a long shot, but it sort of makes sense:
Some of the operational Ta152s were prototypes. JG11 reportedly got a batch of these, although they did not see combat.
The prototypes seem to typicaly have worn schemes in shades of grey, e.g. WN 150055 (V30), which is supposed to have been RLM 74/75, or CI+XM (a 152C proto), etc.
Could Black 14 have been one of these? A prototype put to combat use without being painted to one of the standard 81/82/83 schemes?
ModelArt has a few paint scheme schematics and one JG301 profile of WN 003 (this is V3, right?) in "74/75 (83?)" with a black spinner and a Green 4 numeral, but this same WN "150003" is also depicted in this same book as being the model taken in as FE112. A pretty big error which kills the book's credibility.
But given how amateurish the Black 14 profile is drawn as seen on that Wings Palette website, could these two be the same plane? A prototype put into combat service with its prototype paint scheme?
It seems like the only sensible explanation.