Metallic Silver vs Sterling Silver

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Sterling Silver is a little darker, more saturated than Metallic Silver.

Can I use Sterling Silver instead of Metallic Silver?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Sterling Silver is a little darker, more saturated than Metallic Silver.

Can I use Metallic Silver instead of Sterling Silver?

The same difference applies the other way round: Metallic Silver is a little lighter, 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.