Dark Rust vs Olive-Brown Ops

How close are they?

ΔE 10.7, fair: the same colour family, but not a straight swap. Olive-Brown Ops is more saturated, cooler than Dark Rust.

Can I use Olive-Brown Ops instead of Dark Rust?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Olive-Brown Ops is more saturated, cooler than Dark Rust.

Can I use Dark Rust instead of Olive-Brown Ops?

The same difference applies the other way round: Dark Rust is more muted, warmer.

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.