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