Elven Armour vs Deep Metallic Blue

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Deep Metallic Blue is a little darker, much more muted than Elven Armour.

Can I use Deep Metallic Blue instead of Elven Armour?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Deep Metallic Blue is a little darker, much more muted than Elven Armour.

Can I use Elven Armour instead of Deep Metallic Blue?

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