ΔE 7.2, close: similar, with a visible difference side by side. Copper (Metallic) is a little lighter, more saturated than Mica Silver.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Copper (Metallic) is a little lighter, more saturated than Mica Silver.
The same difference applies the other way round: Mica Silver is a little darker, 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.
See Mica Silver on the colour wheel See Copper (Metallic) on the colour wheel
All matches: Mica Silver equivalents · Copper (Metallic) equivalents