ΔE 20.4, loose: different enough that you should pick on purpose. Traitor Green is much more muted, cooler than Waaagh! Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Traitor Green is much more muted, cooler than Waaagh! Flesh.
The same difference applies the other way round: Waaagh! Flesh is much 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 Waaagh! Flesh on the colour wheel See Traitor Green on the colour wheel
All matches: Waaagh! Flesh equivalents · Traitor Green equivalents