ΔE 34.3, loose: different enough that you should pick on purpose. Ink Dark Turquoise is noticeably darker, much more muted, cooler than Phthalo Green (Yellow Shade).
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 34). Ink Dark Turquoise is noticeably darker, much more muted, cooler than Phthalo Green (Yellow Shade).
The same difference applies the other way round: Phthalo Green (Yellow Shade) is noticeably lighter, much more saturated, 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 Phthalo Green (Yellow Shade) on the colour wheel See Ink Dark Turquoise on the colour wheel
All matches: Phthalo Green (Yellow Shade) equivalents · Ink Dark Turquoise equivalents