Medium Rust vs Rust

How close are they?

ΔE 14.3, fair: the same colour family, but not a straight swap. Rust is a little darker, much more muted than Medium Rust.

Can I use Rust instead of Medium Rust?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Rust is a little darker, much more muted than Medium Rust.

Can I use Medium Rust instead of Rust?

The same difference applies the other way round: Medium Rust is a little lighter, much 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.