Terry Chui and I made the color chart referenced above. I tested many colors in the Montana Gold range, and took the photos.
It is not confirmed that Legacy used Montana Gold paint, and most likely did not. They were used for Rogue One though and are a great series of paint for artists.
As with any paint, there are many routes to get to the right look. The Mandlorian V1 armor will require lots of variation in color through a combination of techniques, including topical damage and washes.