ΔE 21.3, loose: different enough that you should pick on purpose. Snake Green is noticeably darker, warmer than Dark Turquoise.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Snake Green is noticeably darker, warmer than Dark Turquoise.
The same difference applies the other way round: Dark Turquoise is noticeably lighter, 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 Dark Turquoise on the colour wheel See Snake Green on the colour wheel
All matches: Dark Turquoise equivalents · Snake Green equivalents