ΔE 18.4, loose: different enough that you should pick on purpose. Rotten Green is much more saturated, cooler than Pestilent Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Rotten Green is much more saturated, cooler than Pestilent Flesh.
The same difference applies the other way round: Pestilent Flesh is much more muted, 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 Pestilent Flesh on the colour wheel See Rotten Green on the colour wheel
All matches: Pestilent Flesh equivalents · Rotten Green equivalents