ΔE 14.1, fair: the same colour family, but not a straight swap. Kislev Flesh is a little lighter, more muted, warmer than Moonstone Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Kislev Flesh is a little lighter, more muted, warmer than Moonstone Skin.
The same difference applies the other way round: Moonstone Skin is a little darker, more saturated, 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 Moonstone Skin on the colour wheel See Kislev Flesh on the colour wheel
All matches: Moonstone Skin equivalents · Kislev Flesh equivalents