Regal Blue vs Lapislazuli

How close are they?

ΔE 14.6, fair: the same colour family, but not a straight swap. Lapislazuli is noticeably darker, warmer than Regal Blue.

Can I use Lapislazuli instead of Regal Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Lapislazuli is noticeably darker, warmer than Regal Blue.

Can I use Regal Blue instead of Lapislazuli?

The same difference applies the other way round: Regal Blue is noticeably 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.