ΔE 20.6, loose: different enough that you should pick on purpose. Dull Red is noticeably lighter, more saturated, warmer than Crusted Sore.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Dull Red is noticeably lighter, more saturated, warmer than Crusted Sore.
The same difference applies the other way round: Crusted Sore is noticeably darker, more muted, 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.
See Crusted Sore on the colour wheel See Dull Red on the colour wheel
All matches: Crusted Sore equivalents · Dull Red equivalents