ΔE 13.7, fair: the same colour family, but not a straight swap. Light Sand is a little lighter, more saturated than Kislev Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Sand is a little lighter, more saturated than Kislev Flesh.
The same difference applies the other way round: Kislev Flesh is a little darker, 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 Kislev Flesh on the colour wheel See Light Sand on the colour wheel
All matches: Kislev Flesh equivalents · Light Sand equivalents