Turquoise Blue vs Twilight Sky

How close are they?

ΔE 10.3, fair: the same colour family, but not a straight swap. Twilight Sky is a little darker, warmer than Turquoise Blue.

Can I use Twilight Sky instead of Turquoise Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Twilight Sky is a little darker, warmer than Turquoise Blue.

Can I use Turquoise Blue instead of Twilight Sky?

The same difference applies the other way round: Turquoise Blue is a little lighter, 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.