ΔE 10.0, fair: the same colour family, but not a straight swap. Silver Grey is a little lighter, cooler than Deep Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Silver Grey is a little lighter, cooler than Deep Grey.
The same difference applies the other way round: Deep Grey is a little darker, warmer.
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 Deep Grey on the colour wheel See Silver Grey on the colour wheel
All matches: Deep Grey equivalents · Silver Grey equivalents