Field Grey vs Cam. Middle Brown

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Cam. Middle Brown is a little darker, more saturated than Field Grey.

Can I use Cam. Middle Brown instead of Field Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Cam. Middle Brown is a little darker, more saturated than Field Grey.

Can I use Field Grey instead of Cam. Middle Brown?

The same difference applies the other way round: Field Grey is a little lighter, more muted.

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.