Field Drab (FS30118) vs Gorthor Brown

How close are they?

ΔE 10.5, fair: the same colour family, but not a straight swap. Gorthor Brown is a little lighter, warmer than Field Drab (FS30118).

Can I use Gorthor Brown instead of Field Drab (FS30118)?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Gorthor Brown is a little lighter, warmer than Field Drab (FS30118).

Can I use Field Drab (FS30118) instead of Gorthor Brown?

The same difference applies the other way round: Field Drab (FS30118) is a little darker, 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.