Olive Drab vs Green Brown

How close are they?

ΔE 10.5, fair: the same colour family, but not a straight swap. Green Brown is a little lighter, warmer than Olive Drab.

Can I use Green Brown instead of Olive Drab?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Green Brown is a little lighter, warmer than Olive Drab.

Can I use Olive Drab instead of Green Brown?

The same difference applies the other way round: Olive Drab 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.