ΔE 12.4, fair: the same colour family, but not a straight swap. Military Green is a little darker, more saturated than Hardened Carapace.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Military Green is a little darker, more saturated than Hardened Carapace.
The same difference applies the other way round: Hardened Carapace is a little lighter, more muted.
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 Hardened Carapace on the colour wheel See Military Green on the colour wheel
All matches: Hardened Carapace equivalents · Military Green equivalents