ΔE 10.3, fair: the same colour family, but not a straight swap. Gunship Green is a little darker, more saturated, cooler than Eidolon 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 darker, more saturated, cooler than Eidolon Grey.
The same difference applies the other way round: Eidolon Grey is a little lighter, more muted, 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 Eidolon Grey on the colour wheel See Gunship Green on the colour wheel
All matches: Eidolon Grey equivalents · Gunship Green equivalents