ΔE 23.4, loose: different enough that you should pick on purpose. Hydra Turquoise is a little lighter, much more saturated, cooler than Astral Beryllium.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Hydra Turquoise is a little lighter, much more saturated, cooler than Astral Beryllium.
The same difference applies the other way round: Astral Beryllium is a little darker, 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 Astral Beryllium on the colour wheel See Hydra Turquoise on the colour wheel
All matches: Astral Beryllium equivalents · Hydra Turquoise equivalents