ΔE 8.9, close: similar, with a visible difference side by side. Centaur Skin is a little darker, more muted than Gnome Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Centaur Skin is a little darker, more muted than Gnome Skin.
The same difference applies the other way round: Gnome Skin is a little 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 Gnome Skin on the colour wheel See Centaur Skin on the colour wheel
All matches: Gnome Skin equivalents · Centaur Skin equivalents