ΔE 13.1, fair: the same colour family, but not a straight swap. Astorath Red is a little lighter, warmer than Blood Thorn.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Astorath Red is a little lighter, warmer than Blood Thorn.
The same difference applies the other way round: Blood Thorn is a little darker, 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 Blood Thorn on the colour wheel See Astorath Red on the colour wheel
All matches: Blood Thorn equivalents · Astorath Red equivalents