ΔE 9.5, close: similar, with a visible difference side by side. Steel Legion Drab is a little lighter, cooler than Nº5 Earth Brown (FS30099).
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Steel Legion Drab is a little lighter, cooler than Nº5 Earth Brown (FS30099).
The same difference applies the other way round: Nº5 Earth Brown (FS30099) is a little darker, warmer.
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 Nº5 Earth Brown (FS30099) on the colour wheel See Steel Legion Drab on the colour wheel
All matches: Nº5 Earth Brown (FS30099) equivalents · Steel Legion Drab equivalents