ΔE 11.5, fair: the same colour family, but not a straight swap. Tourmaline Skin is noticeably darker, cooler than Pastel Pink.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Tourmaline Skin is noticeably darker, cooler than Pastel Pink.
The same difference applies the other way round: Pastel Pink is noticeably lighter, 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 Pastel Pink on the colour wheel See Tourmaline Skin on the colour wheel
All matches: Pastel Pink equivalents · Tourmaline Skin equivalents