ΔE 8.5, close: similar, with a visible difference side by side. Light Orange is a little lighter, more saturated than Light Rust.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Orange is a little lighter, more saturated than Light Rust.
The same difference applies the other way round: Light Rust is a little 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 Light Orange on the colour wheel
All matches: Light Rust equivalents · Light Orange equivalents