ΔE 10.2, fair: the same colour family, but not a straight swap. Obsidian Black is a little darker, more muted than Bright Silver.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Obsidian Black is a little darker, more muted than Bright Silver.
The same difference applies the other way round: Bright Silver is a little lighter, more saturated.
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 Bright Silver on the colour wheel See Obsidian Black on the colour wheel
All matches: Bright Silver equivalents · Obsidian Black equivalents