Medium Rust vs Lugganath Orange

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Lugganath Orange is more saturated than Medium Rust.

Can I use Lugganath Orange instead of Medium Rust?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Lugganath Orange is more saturated than Medium Rust.

Can I use Medium Rust instead of Lugganath Orange?

The same difference applies the other way round: Medium Rust is 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.