ΔE 11.1, fair: the same colour family, but not a straight swap. Hammered Copper is a little lighter than Natural Steel.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Hammered Copper is a little lighter than Natural Steel.
The same difference applies the other way round: Natural Steel is a little 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.
See Natural Steel on the colour wheel See Hammered Copper on the colour wheel
All matches: Natural Steel equivalents · Hammered Copper equivalents