Hello!
I wouldn't be too picky here, when it goes about colour conversion - depending on factory, materials used, lighting, local dirt, lighting, and the list goes on, the actual colours would appear different. What I recommend is a lot of looking at references (remember, photos distort the colours, too, not to mention that dyes fade a lot during 70 years), a little experimenting and picking what looks best to you. Good luck with your builds and have a nice day
Paweł