ΔE 8.5, close: similar, with a visible difference side by side. Black Red is a little darker, warmer than Crimson Hell.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Black Red is a little darker, warmer than Crimson Hell.
The same difference applies the other way round: Crimson Hell is a little lighter, cooler.
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 Crimson Hell on the colour wheel See Black Red on the colour wheel
All matches: Crimson Hell equivalents · Black Red equivalents