ΔE 17.8, loose: different enough that you should pick on purpose. Violet is a little darker, more saturated, cooler than Crimson Hell.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Violet is a little darker, more saturated, cooler than Crimson Hell.
The same difference applies the other way round: Crimson Hell is a little lighter, more muted, warmer.
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 Violet on the colour wheel
All matches: Crimson Hell equivalents · Violet equivalents