ΔE 12.3, fair: the same colour family, but not a straight swap. Sunset Orange is noticeably lighter, more saturated than Light Rust.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Sunset Orange is noticeably lighter, more saturated than Light Rust.
The same difference applies the other way round: Light Rust is noticeably darker, more muted.
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 Light Rust on the colour wheel See Sunset Orange on the colour wheel
All matches: Light Rust equivalents · Sunset Orange equivalents