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