ΔE 6.8, close: similar, with a visible difference side by side. Moon Mist Grey is more saturated than Brigade Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Moon Mist Grey is more saturated than Brigade Grey.
The same difference applies the other way round: Brigade Grey is more muted.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Brigade Grey on the colour wheel See Moon Mist Grey on the colour wheel
All matches: Brigade Grey equivalents · Moon Mist Grey equivalents