ΔE 9.6, close: similar, with a visible difference side by side. Light Red is a little lighter, more saturated than Primary Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Light Red is a little lighter, more saturated than Primary Red.
The same difference applies the other way round: Primary Red is a little darker, more muted.
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.
See Primary Red on the colour wheel See Light Red on the colour wheel
All matches: Primary Red equivalents · Light Red equivalents