ΔE 13.3, fair: the same colour family, but not a straight swap. Caribbean Turquoise is noticeably darker, more muted, cooler than Dark Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Caribbean Turquoise is noticeably darker, more muted, cooler than Dark Turquoise.
The same difference applies the other way round: Dark Turquoise is noticeably lighter, 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 Dark Turquoise on the colour wheel See Caribbean Turquoise on the colour wheel
All matches: Dark Turquoise equivalents · Caribbean Turquoise equivalents