ΔE 12.9, fair: the same colour family, but not a straight swap. Elf Skin Tone is a little darker, more muted, cooler than Light Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Elf Skin Tone is a little darker, more muted, cooler than Light Brown.
The same difference applies the other way round: Light Brown is a little lighter, 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 Light Brown on the colour wheel See Elf Skin Tone on the colour wheel
All matches: Light Brown equivalents · Elf Skin Tone equivalents