ΔE 7.3, close: similar, with a visible difference side by side. Orange Rust is more muted than Amaranth Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Orange Rust is more muted than Amaranth Red.
The same difference applies the other way round: Amaranth Red is 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 Amaranth Red on the colour wheel See Orange Rust on the colour wheel
All matches: Amaranth Red equivalents · Orange Rust equivalents