ΔE 10.0, fair: the same colour family, but not a straight swap. Gunship Green is a little lighter, more saturated than Field Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Gunship Green is a little lighter, more saturated than Field Grey.
The same difference applies the other way round: Field Grey is a little darker, 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 Field Grey on the colour wheel See Gunship Green on the colour wheel
All matches: Field Grey equivalents · Gunship Green equivalents