ΔE 10.7, fair: the same colour family, but not a straight swap. Silver is noticeably lighter than Metallic Gray.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Silver is noticeably lighter than Metallic Gray.
The same difference applies the other way round: Metallic Gray is noticeably 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 Metallic Gray on the colour wheel See Silver on the colour wheel
All matches: Metallic Gray equivalents · Silver equivalents