ΔE 12.4, fair: the same colour family, but not a straight swap. Kislev Flesh is noticeably darker than Pastel Pink.
Can I use Kislev Flesh instead of Pastel Pink?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Kislev Flesh is noticeably darker than Pastel Pink.
Can I use Pastel Pink instead of Kislev Flesh?
The same difference applies the other way round: Pastel Pink is noticeably lighter.
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.