ΔE 14.3, fair: the same colour family, but not a straight swap. Rosy Shadow is a little darker, more muted, cooler than Kislev Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Rosy Shadow is a little darker, more muted, cooler than Kislev Flesh.
The same difference applies the other way round: Kislev Flesh is a little lighter, more saturated, warmer.
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 Rosy Shadow on the colour wheel
All matches: Kislev Flesh equivalents · Rosy Shadow equivalents