ΔE 18.6, loose: different enough that you should pick on purpose. Dull Red is noticeably lighter, warmer than Beret Maroon.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Dull Red is noticeably lighter, warmer than Beret Maroon.
The same difference applies the other way round: Beret Maroon is noticeably darker, 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 Beret Maroon on the colour wheel See Dull Red on the colour wheel
All matches: Beret Maroon equivalents · Dull Red equivalents