Dark Angels Green vs Azure

How close are they?

ΔE 23.1, loose: different enough that you should pick on purpose. Azure is a little darker, more muted, cooler than Dark Angels Green.

Can I use Azure instead of Dark Angels Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Azure is a little darker, more muted, cooler than Dark Angels Green.

Can I use Dark Angels Green instead of Azure?

The same difference applies the other way round: Dark Angels Green is a little lighter, 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.