ΔE 7.0, close: similar, with a visible difference side by side. Administratum Grey is a little lighter than Grey Light Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Administratum Grey is a little lighter than Grey Light Brown.
The same difference applies the other way round: Grey Light Brown is a little darker.
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 Grey Light Brown on the colour wheel See Administratum Grey on the colour wheel
All matches: Grey Light Brown equivalents · Administratum Grey equivalents