ΔE 11.3, fair: the same colour family, but not a straight swap. Ruby Skin is a little lighter, more muted than Sickly Pink.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ruby Skin is a little lighter, more muted than Sickly Pink.
The same difference applies the other way round: Sickly Pink is a little darker, 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 Sickly Pink on the colour wheel See Ruby Skin on the colour wheel
All matches: Sickly Pink equivalents · Ruby Skin equivalents