ΔE 16.0, loose: different enough that you should pick on purpose. Blood Thorn is a little lighter, much more saturated than Infernal Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Blood Thorn is a little lighter, much more saturated than Infernal Red.
The same difference applies the other way round: Infernal Red is a little darker, much 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 Infernal Red on the colour wheel See Blood Thorn on the colour wheel
All matches: Infernal Red equivalents · Blood Thorn equivalents