ΔE 12.3, fair: the same colour family, but not a straight swap. Sky is a little lighter, cooler than Tyrant Skull.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Sky is a little lighter, cooler than Tyrant Skull.
The same difference applies the other way round: Tyrant Skull is a little darker, 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 Tyrant Skull on the colour wheel See Sky on the colour wheel
All matches: Tyrant Skull equivalents · Sky equivalents