ΔE 23.2, loose: different enough that you should pick on purpose. Silver Grey is noticeably darker, much more muted than Skink Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Silver Grey is noticeably darker, much more muted than Skink Blue.
The same difference applies the other way round: Skink Blue is noticeably lighter, much 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 Skink Blue on the colour wheel See Silver Grey on the colour wheel
All matches: Skink Blue equivalents · Silver Grey equivalents