ΔE 12.5, fair: the same colour family, but not a straight swap. Pure Red is noticeably darker, more muted than Deep Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Pure Red is noticeably darker, more muted than Deep Red.
The same difference applies the other way round: Deep Red is noticeably lighter, 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.
See Deep Red on the colour wheel See Pure Red on the colour wheel
All matches: Deep Red equivalents · Pure Red equivalents