ΔE 12.6, fair: the same colour family, but not a straight swap. Kislev Flesh is much more muted than Barbarian Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Kislev Flesh is much more muted than Barbarian Flesh.
The same difference applies the other way round: Barbarian Flesh is much more saturated.
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 Barbarian Flesh on the colour wheel See Kislev Flesh on the colour wheel
All matches: Barbarian Flesh equivalents · Kislev Flesh equivalents