ΔE 12.9, fair: the same colour family, but not a straight swap. Eldar Flesh is a little darker, more muted, warmer than Sickly Pink.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Eldar Flesh is a little darker, more muted, warmer than Sickly Pink.
The same difference applies the other way round: Sickly Pink is a little lighter, more saturated, 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 Sickly Pink on the colour wheel See Eldar Flesh on the colour wheel
All matches: Sickly Pink equivalents · Eldar Flesh equivalents