ΔE 11.9, fair: the same colour family, but not a straight swap. Ionrach Skin is noticeably darker, cooler than Elven Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ionrach Skin is noticeably darker, cooler than Elven Flesh.
The same difference applies the other way round: Elven Flesh 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 Elven Flesh on the colour wheel See Ionrach Skin on the colour wheel
All matches: Elven Flesh equivalents · Ionrach Skin equivalents