SLA Blue vs Ruinous Spell

How close are they?

ΔE 13.9, fair: the same colour family, but not a straight swap. Ruinous Spell is a little darker, much more saturated, warmer than SLA Blue.

Can I use Ruinous Spell instead of SLA Blue?

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, much more saturated, warmer than SLA Blue.

Can I use SLA Blue instead of Ruinous Spell?

The same difference applies the other way round: SLA Blue is a little lighter, much more muted, 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.