Space Red vs Dark Vermilion

How close are they?

ΔE 11.9, fair: the same colour family, but not a straight swap. Dark Vermilion is a little darker, warmer than Space Red.

Can I use Dark Vermilion instead of Space Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Vermilion is a little darker, warmer than Space Red.

Can I use Space Red instead of Dark Vermilion?

The same difference applies the other way round: Space Red is a little lighter, 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.