Ruinous Spell vs Dark Camo Green

How close are they?

ΔE 17.8, loose: different enough that you should pick on purpose. Dark Camo Green is a little darker, much more muted, warmer than Ruinous Spell.

Can I use Dark Camo Green instead of Ruinous Spell?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Dark Camo Green is a little darker, much more muted, warmer than Ruinous Spell.

Can I use Ruinous Spell instead of Dark Camo Green?

The same difference applies the other way round: Ruinous Spell is a little lighter, much more saturated, 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.