Elven Armour vs Metallic Blue

How close are they?

ΔE 33.5, loose: different enough that you should pick on purpose. Metallic Blue is noticeably lighter, much more muted, cooler than Elven Armour.

Can I use Metallic Blue instead of Elven Armour?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 34). Metallic Blue is noticeably lighter, much more muted, cooler than Elven Armour.

Can I use Elven Armour instead of Metallic Blue?

The same difference applies the other way round: Elven Armour is noticeably darker, 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.