ΔE 14.6, fair: the same colour family, but not a straight swap. Rotten Flesh is a little darker, warmer than Militarum Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Rotten Flesh is a little darker, warmer than Militarum Green.
The same difference applies the other way round: Militarum Green is a little lighter, 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 Militarum Green on the colour wheel See Rotten Flesh on the colour wheel
All matches: Militarum Green equivalents · Rotten Flesh equivalents