ΔE 11.6, fair: the same colour family, but not a straight swap. Ionrach Skin is a little lighter, more saturated, warmer than Warm Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ionrach Skin is a little lighter, more saturated, warmer than Warm Grey.
The same difference applies the other way round: Warm Grey is a little darker, more muted, 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 Warm Grey on the colour wheel See Ionrach Skin on the colour wheel
All matches: Warm Grey equivalents · Ionrach Skin equivalents