ΔE 7.2, close: similar, with a visible difference side by side. Light Rust is a little lighter than Light Leather.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Rust is a little lighter than Light Leather.
The same difference applies the other way round: Light Leather is a little darker.
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 Leather on the colour wheel See Light Rust on the colour wheel
All matches: Light Leather equivalents · Light Rust equivalents