ΔE 14.8, fair: the same colour family, but not a straight swap. Warm Flesh is noticeably lighter, cooler than Eldar Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Warm Flesh is noticeably lighter, cooler than Eldar Flesh.
The same difference applies the other way round: Eldar Flesh is noticeably darker, 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 Eldar Flesh on the colour wheel See Warm Flesh on the colour wheel
All matches: Eldar Flesh equivalents · Warm Flesh equivalents