Mustard vs Ryza Rust

How close are they?

ΔE 13.2, fair: the same colour family, but not a straight swap. Ryza Rust is a little darker, more saturated, warmer than Mustard.

Can I use Ryza Rust instead of Mustard?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ryza Rust is a little darker, more saturated, warmer than Mustard.

Can I use Mustard instead of Ryza Rust?

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

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.