ΔE 15.7, loose: different enough that you should pick on purpose. Grizzly Brown is noticeably darker, cooler than Dusk Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Grizzly Brown is noticeably darker, cooler than Dusk Red.
The same difference applies the other way round: Dusk Red is noticeably lighter, 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 Dusk Red on the colour wheel See Grizzly Brown on the colour wheel
All matches: Dusk Red equivalents · Grizzly Brown equivalents