ΔE 14.2, fair: the same colour family, but not a straight swap. Green Glaze is a little lighter, more muted, cooler than Tyrant Skull. They are different kinds of paint: Citadel Tyrant Skull is an opaque base/layer paint and Two Thin Coats Green Glaze is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Green Glaze is a little lighter, more muted, cooler than Tyrant Skull. They are different kinds of paint.
The same difference applies the other way round: Tyrant Skull is a little darker, more saturated, 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 Green Glaze on the colour wheel
All matches: Tyrant Skull equivalents · Green Glaze equivalents