ΔE 13.5, fair: the same colour family, but not a straight swap. Trollblood Highlight is noticeably darker, more muted than Screaming Skull.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Trollblood Highlight is noticeably darker, more muted than Screaming Skull.
The same difference applies the other way round: Screaming Skull is noticeably lighter, more saturated.
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 Trollblood Highlight on the colour wheel
All matches: Screaming Skull equivalents · Trollblood Highlight equivalents