Grey-Brown vs Steel Legion Drab

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Steel Legion Drab is a little darker, more muted, warmer than Grey-Brown.

Can I use Steel Legion Drab instead of Grey-Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Steel Legion Drab is a little darker, more muted, warmer than Grey-Brown.

Can I use Grey-Brown instead of Steel Legion Drab?

The same difference applies the other way round: Grey-Brown is a little lighter, more saturated, cooler.

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.