ΔE 11.1, fair: the same colour family, but not a straight swap. Russian Green 2 is more muted than Waaagh! Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Russian Green 2 is more muted than Waaagh! Flesh.
The same difference applies the other way round: Waaagh! Flesh is more saturated.
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 Russian Green 2 on the colour wheel
All matches: Waaagh! Flesh equivalents · Russian Green 2 equivalents