ΔE 13.0, fair: the same colour family, but not a straight swap. Ahriman Blue is cooler than Dark Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ahriman Blue is cooler than Dark Turquoise.
The same difference applies the other way round: Dark Turquoise is 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 Ahriman Blue on the colour wheel
All matches: Dark Turquoise equivalents · Ahriman Blue equivalents