ΔE 13.7, fair: the same colour family, but not a straight swap. IDF/IAF Green is noticeably lighter, cooler than Olive Green (USAF).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). IDF/IAF Green is noticeably lighter, cooler than Olive Green (USAF).
The same difference applies the other way round: Olive Green (USAF) is noticeably darker, 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 Olive Green (USAF) on the colour wheel See IDF/IAF Green on the colour wheel
All matches: Olive Green (USAF) equivalents · IDF/IAF Green equivalents