Ruinous Spell vs Dark Green (IJA)

How close are they?

ΔE 7.0, close: similar, with a visible difference side by side. Dark Green (IJA) is a little lighter, warmer than Ruinous Spell.

Can I use Dark Green (IJA) instead of Ruinous Spell?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Green (IJA) is a little lighter, warmer than Ruinous Spell.

Can I use Ruinous Spell instead of Dark Green (IJA)?

The same difference applies the other way round: Ruinous Spell is a little darker, cooler.

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.