ΔE 7.7, close: similar, with a visible difference side by side. Elf Skin Tone is cooler than Yellow Shadow.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Elf Skin Tone is cooler than Yellow Shadow.
The same difference applies the other way round: Yellow Shadow is 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 Yellow Shadow on the colour wheel See Elf Skin Tone on the colour wheel
All matches: Yellow Shadow equivalents · Elf Skin Tone equivalents