Deep Azure vs Lucky 38

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Lucky 38 is a little lighter, more muted than Deep Azure.

Can I use Lucky 38 instead of Deep Azure?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Lucky 38 is a little lighter, more muted than Deep Azure.

Can I use Deep Azure instead of Lucky 38?

The same difference applies the other way round: Deep Azure 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.