ΔE 10.6, fair: the same colour family, but not a straight swap. Dark Blue is more saturated, warmer than Turquoise Deep.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Blue is more saturated, warmer than Turquoise Deep.
The same difference applies the other way round: Turquoise Deep is more muted, cooler.
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 Turquoise Deep on the colour wheel See Dark Blue on the colour wheel
All matches: Turquoise Deep equivalents · Dark Blue equivalents