The way I see it, and its MHO, is that this skin is on the correct aircraft. Everything matches a G-14, werk number, reports, even the pilot himself wrote in his diary that it was a G-14. Just because his aircraft wasnt equipped with MW-50 doesnt automatically make it a G-6. If we are playing a game where we want everything as historically as possible, then this skin belongs on the G-14.
The only way I can see this going on the G-6 is if someone can bring up evidence that this aircraft was a G-6 and not a G-14, as not having MW-50 boost doesnt automatically make it a G-6.