ΔE 8.0, close: similar, with a visible difference side by side. Yellow Ochre is a little darker than Medium Rust.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Yellow Ochre is a little darker than Medium Rust.
The same difference applies the other way round: Medium Rust is a little lighter.
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 Medium Rust on the colour wheel See Yellow Ochre on the colour wheel
All matches: Medium Rust equivalents · Yellow Ochre equivalents