ΔE 9.9, close: similar, with a visible difference side by side. Peach Flesh is a little lighter, warmer than Kislev Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Peach Flesh is a little lighter, warmer than Kislev Flesh.
The same difference applies the other way round: Kislev Flesh is a little darker, 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 Kislev Flesh on the colour wheel See Peach Flesh on the colour wheel
All matches: Kislev Flesh equivalents · Peach Flesh equivalents