It seems there was a mix up at the factory (in china) on that day cos the orange chrono hand and subdial colour should only be on the brown dial/bezel carrera
and i think the blue dial carrera too. There is 2 black dial models, one is the tachy racing (red chrono hands and silver lining on the subdials) and one is the non racing black carrera (silver subdials and silver chrono hands).
Go to the Tag website you can see them all there.
I would try to source another carrera on the cheap maybe used, and swap the pieces you need to make it accurate.
In terms of the solid feeling and weight of the carrera case, the reps are the real deal. Infact if you closed your eyes and put one in each hand you would probably not be able to tell the difference.
So get yourself the correct dial and hand colour combinations and a ETA movement swap with correct date font, swap the rotor from the rep (cos it has the correct Tag engraving and is interchangable as its also a 7750) As tag do no modifying to the 7750 ETA eubache in the carrera and you have a gen minus the paperwork and box!
its worth the money and time if you can afford it as you will enjoy wearing it with pride.
Goodluck.