ΔE 19.3, loose: different enough that you should pick on purpose. Nocturnal Red is noticeably darker, more muted, cooler than Dull Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Nocturnal Red is noticeably darker, more muted, cooler than Dull Red.
The same difference applies the other way round: Dull Red is noticeably lighter, more saturated, warmer.
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 Dull Red on the colour wheel See Nocturnal Red on the colour wheel
All matches: Dull Red equivalents · Nocturnal Red equivalents