Sapphire Gem vs Azurite Hue

How close are they?

ΔE 16.4, loose: different enough that you should pick on purpose. Azurite Hue is a little darker, much more muted, cooler than Sapphire Gem.

Can I use Azurite Hue instead of Sapphire Gem?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Azurite Hue is a little darker, much more muted, cooler than Sapphire Gem.

Can I use Sapphire Gem instead of Azurite Hue?

The same difference applies the other way round: Sapphire Gem is a little lighter, much 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.