Magnus the Red vs Dark Purple

How close are they?

ΔE 14.4, fair: the same colour family, but not a straight swap. Dark Purple is much more muted than Magnus the Red.

Can I use Dark Purple instead of Magnus the Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Purple is much more muted than Magnus the Red.

Can I use Magnus the Red instead of Dark Purple?

The same difference applies the other way round: Magnus the Red is 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.