Elven Armour vs Metallic Purple

How close are they?

ΔE 26.8, loose: different enough that you should pick on purpose. Metallic Purple is noticeably lighter, much more muted than Elven Armour.

Can I use Metallic Purple instead of Elven Armour?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Metallic Purple is noticeably lighter, much more muted than Elven Armour.

Can I use Elven Armour instead of Metallic Purple?

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