ΔE 13.0, fair: the same colour family, but not a straight swap. Bright Orange is noticeably darker, cooler than Orange Rust.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Bright Orange is noticeably darker, cooler than Orange Rust.
The same difference applies the other way round: Orange Rust is noticeably lighter, 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.
See Orange Rust on the colour wheel See Bright Orange on the colour wheel
All matches: Orange Rust equivalents · Bright Orange equivalents