Space Dark Green vs Ruinous Spell

How close are they?

ΔE 14.2, fair: the same colour family, but not a straight swap. Ruinous Spell is a little darker, more saturated, cooler than Space Dark Green.

Can I use Ruinous Spell instead of Space Dark Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Ruinous Spell is a little darker, more saturated, cooler than Space Dark Green.

Can I use Space Dark Green instead of Ruinous Spell?

The same difference applies the other way round: Space Dark Green is a little lighter, more muted, 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.