Ironbreaker vs Gunmetal Grey

How close are they?

ΔE 14.6, fair: the same colour family, but not a straight swap. Gunmetal Grey is noticeably lighter than Ironbreaker.

Can I use Gunmetal Grey instead of Ironbreaker?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Gunmetal Grey is noticeably lighter than Ironbreaker.

Can I use Ironbreaker instead of Gunmetal Grey?

The same difference applies the other way round: Ironbreaker is noticeably darker.

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.