Saphire Blue vs Lothern Blue

How close are they?

ΔE 11.1, fair: the same colour family, but not a straight swap. Lothern Blue is a little darker, warmer than Saphire Blue.

Can I use Lothern Blue instead of Saphire Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Lothern Blue is a little darker, warmer than Saphire Blue.

Can I use Saphire Blue instead of Lothern Blue?

The same difference applies the other way round: Saphire 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.