Phantasmal Blue vs Light Blue

How close are they?

ΔE 12.7, fair: the same colour family, but not a straight swap. Light Blue is a little lighter, more muted than Phantasmal Blue.

Can I use Light Blue instead of Phantasmal Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Light Blue is a little lighter, more muted than Phantasmal Blue.

Can I use Phantasmal Blue instead of Light Blue?

The same difference applies the other way round: Phantasmal Blue is a little darker, more saturated.

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.