Sanguine Highlight vs Red

How close are they?

ΔE 10.6, fair: the same colour family, but not a straight swap. Red is a little darker, warmer than Sanguine Highlight.

Can I use Red instead of Sanguine Highlight?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Red is a little darker, warmer than Sanguine Highlight.

Can I use Sanguine Highlight instead of Red?

The same difference applies the other way round: Sanguine Highlight 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.