ΔE 11.6, fair: the same colour family, but not a straight swap. Space Grey is a little lighter, cooler than Gunner Camo.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Space Grey is a little lighter, cooler than Gunner Camo.
The same difference applies the other way round: Gunner Camo is a little 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 Gunner Camo on the colour wheel See Space Grey on the colour wheel
All matches: Gunner Camo equivalents · Space Grey equivalents