Mushroom Brown vs Orange Rust

How close are they?

ΔE 10.9, fair: the same colour family, but not a straight swap. Orange Rust is a little lighter, more saturated, cooler than Mushroom Brown.

Can I use Orange Rust instead of Mushroom Brown?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Orange Rust is a little lighter, more saturated, cooler than Mushroom Brown.

Can I use Mushroom Brown instead of Orange Rust?

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