ΔE 9.6, close: similar, with a visible difference side by side. Red RLM23 is a little darker, more saturated than Amaranth Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Red RLM23 is a little darker, more saturated than Amaranth Red.
The same difference applies the other way round: Amaranth Red is a little lighter, 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 Amaranth Red on the colour wheel See Red RLM23 on the colour wheel
All matches: Amaranth Red equivalents · Red RLM23 equivalents