ΔE 12.3, fair: the same colour family, but not a straight swap. Hammered Copper is a little darker than Chrome Silver.
Can I use Hammered Copper instead of Chrome Silver?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Hammered Copper is a little darker than Chrome Silver.
Can I use Chrome Silver instead of Hammered Copper?
The same difference applies the other way round: Chrome Silver is a little lighter.
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.