ΔE 7.6, close: similar, with a visible difference side by side. Terran Khaki is a little darker, warmer than Zombie Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Terran Khaki is a little darker, warmer than Zombie Flesh.
The same difference applies the other way round: Zombie Flesh 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 Zombie Flesh on the colour wheel See Terran Khaki on the colour wheel
All matches: Zombie Flesh equivalents · Terran Khaki equivalents