ΔE 7.6, close: similar, with a visible difference side by side. Amaranth Red is a little lighter than Carnage Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Amaranth Red is a little lighter than Carnage Red.
The same difference applies the other way round: Carnage Red 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 Carnage Red on the colour wheel See Amaranth Red on the colour wheel
All matches: Carnage Red equivalents · Amaranth Red equivalents