ΔE 28.1, loose: different enough that you should pick on purpose. Hydra Turquoise is noticeably darker, much more saturated, cooler than Green Pearl.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Hydra Turquoise is noticeably darker, much more saturated, cooler than Green Pearl.
The same difference applies the other way round: Green Pearl is noticeably lighter, much more muted, 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 Green Pearl on the colour wheel See Hydra Turquoise on the colour wheel
All matches: Green Pearl equivalents · Hydra Turquoise equivalents