ΔE 7.5, close: similar, with a visible difference side by side. Eldar Flesh is a little darker, warmer than Centaur Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Eldar Flesh is a little darker, warmer than Centaur Skin.
The same difference applies the other way round: Centaur Skin is a little lighter, cooler.
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 Eldar Flesh on the colour wheel
All matches: Centaur Skin equivalents · Eldar Flesh equivalents