Turquoise Siren vs Hiril Blue

How close are they?

ΔE 12.5, fair: the same colour family, but not a straight swap. Hiril Blue is more muted, cooler than Turquoise Siren.

Can I use Hiril Blue instead of Turquoise Siren?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Hiril Blue is more muted, cooler than Turquoise Siren.

Can I use Turquoise Siren instead of Hiril Blue?

The same difference applies the other way round: Turquoise Siren is 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.