ΔE 9.6, close: similar, with a visible difference side by side. Fair Shadow is a little darker, more saturated than Centaur Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Fair Shadow is a little darker, more saturated than Centaur Skin.
The same difference applies the other way round: Centaur Skin is a little lighter, more muted.
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 Centaur Skin on the colour wheel See Fair Shadow on the colour wheel
All matches: Centaur Skin equivalents · Fair Shadow equivalents