ΔE 10.1, fair: the same colour family, but not a straight swap. Turquoise is a little lighter, cooler than Twilight Sky.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Turquoise is a little lighter, cooler than Twilight Sky.
The same difference applies the other way round: Twilight Sky is a little darker, 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 Twilight Sky on the colour wheel See Turquoise on the colour wheel
All matches: Twilight Sky equivalents · Turquoise equivalents