ΔE 8.5, close: similar, with a visible difference side by side. Black (Metallic) is a little lighter than Silver Sun.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Black (Metallic) is a little lighter than Silver Sun.
The same difference applies the other way round: Silver Sun 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 Silver Sun on the colour wheel See Black (Metallic) on the colour wheel
All matches: Silver Sun equivalents · Black (Metallic) equivalents