ΔE 10.1, fair: the same colour family, but not a straight swap. Opal Skin is a little lighter, more muted, warmer than Salmon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Opal Skin is a little lighter, more muted, warmer than Salmon.
The same difference applies the other way round: Salmon is a little darker, 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 Salmon on the colour wheel See Opal Skin on the colour wheel
All matches: Salmon equivalents · Opal Skin equivalents