Command Red vs Hellspawn Red

How close are they?

ΔE 10.2, fair: the same colour family, but not a straight swap. Hellspawn Red is a little lighter, more muted than Command Red.

Can I use Hellspawn Red instead of Command Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Hellspawn Red is a little lighter, more muted than Command Red.

Can I use Command Red instead of Hellspawn Red?

The same difference applies the other way round: Command Red is a little darker, 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.