ΔE 22.7, loose: different enough that you should pick on purpose. Dark Turquoise is noticeably darker, much more saturated, warmer than Gryph-Charger Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Dark Turquoise is noticeably darker, much more saturated, warmer than Gryph-Charger Grey.
The same difference applies the other way round: Gryph-Charger Grey is noticeably lighter, much more muted, cooler.
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 Gryph-Charger Grey on the colour wheel See Dark Turquoise on the colour wheel
All matches: Gryph-Charger Grey equivalents · Dark Turquoise equivalents