ΔE 7.0, close: similar, with a visible difference side by side. Kislev Flesh is a little lighter than Warm Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Kislev Flesh is a little lighter than Warm Skin.
The same difference applies the other way round: Warm Skin is a little darker.
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 Warm Skin on the colour wheel See Kislev Flesh on the colour wheel
All matches: Warm Skin equivalents · Kislev Flesh equivalents