Polished Silver vs Hammered Copper

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Hammered Copper is more saturated than Polished Silver.

Can I use Hammered Copper instead of Polished Silver?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Hammered Copper is more saturated than Polished Silver.

Can I use Polished Silver instead of Hammered Copper?

The same difference applies the other way round: Polished Silver is more muted.

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.