ΔE 14.0, fair: the same colour family, but not a straight swap. IJA Grey Green is a little darker, much more muted than Hammerfall Khaki.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). IJA Grey Green is a little darker, much more muted than Hammerfall Khaki.
The same difference applies the other way round: Hammerfall Khaki is a little lighter, much more saturated.
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 Hammerfall Khaki on the colour wheel See IJA Grey Green on the colour wheel
All matches: Hammerfall Khaki equivalents · IJA Grey Green equivalents