ΔE 14.1, fair: the same colour family, but not a straight swap. Thrall Flesh is more saturated, cooler than Screaming Skull.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Thrall Flesh is more saturated, cooler than Screaming Skull.
The same difference applies the other way round: Screaming Skull is 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 Screaming Skull on the colour wheel See Thrall Flesh on the colour wheel
All matches: Screaming Skull equivalents · Thrall Flesh equivalents