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