ΔE 8.4, close: similar, with a visible difference side by side. Ivory White is a little lighter, more muted, cooler than Elf Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ivory White is a little lighter, more muted, cooler than Elf Skin.
The same difference applies the other way round: Elf Skin is a little darker, more saturated, 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 Elf Skin on the colour wheel See Ivory White on the colour wheel
All matches: Elf Skin equivalents · Ivory White equivalents