ΔE 18.2, loose: different enough that you should pick on purpose. Light Turquoise is a little darker, much more saturated than Silver Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Light Turquoise is a little darker, much more saturated than Silver Grey.
The same difference applies the other way round: Silver Grey is a little lighter, much more muted.
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 Grey on the colour wheel See Light Turquoise on the colour wheel
All matches: Silver Grey equivalents · Light Turquoise equivalents