ΔE 12.8, fair: the same colour family, but not a straight swap. The Fang is noticeably lighter, warmer than Shadow Thorn.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). The Fang is noticeably lighter, warmer than Shadow Thorn.
The same difference applies the other way round: Shadow Thorn is noticeably 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 Shadow Thorn on the colour wheel See The Fang on the colour wheel
All matches: Shadow Thorn equivalents · The Fang equivalents