ΔE 34.8, loose: different enough that you should pick on purpose. Army Green is noticeably lighter, warmer than Orruk Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Army Green is noticeably lighter, warmer than Orruk Flesh.
The same difference applies the other way round: Orruk Flesh is noticeably darker, 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 Orruk Flesh on the colour wheel See Army Green on the colour wheel
All matches: Orruk Flesh equivalents · Army Green equivalents