ΔE 28.7, loose: different enough that you should pick on purpose. Matt Orange is noticeably lighter, much more muted than Light Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Matt Orange is noticeably lighter, much more muted than Light Rust.
The same difference applies the other way round: Light Rust is noticeably darker, 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.
See Light Rust on the colour wheel See Matt Orange on the colour wheel
All matches: Light Rust equivalents · Matt Orange equivalents