ΔE 27.6, loose: different enough that you should pick on purpose. Hydra Turquoise is noticeably lighter, much more saturated, cooler than Cold Steel.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Hydra Turquoise is noticeably lighter, much more saturated, cooler than Cold Steel.
The same difference applies the other way round: Cold Steel is noticeably 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 Cold Steel on the colour wheel See Hydra Turquoise on the colour wheel
All matches: Cold Steel equivalents · Hydra Turquoise equivalents