Chestnut Brown vs Rust

How close are they?

ΔE 11.9, fair: the same colour family, but not a straight swap. Rust is a little lighter, more muted than Chestnut Brown.

Can I use Rust instead of Chestnut Brown?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Rust is a little lighter, more muted than Chestnut Brown.

Can I use Chestnut Brown instead of Rust?

The same difference applies the other way round: Chestnut Brown is a little darker, more saturated.

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.