ΔE 15.8, loose: different enough that you should pick on purpose. Desert Brown is much more muted, cooler than Ryza Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Desert Brown is much more muted, cooler than Ryza Rust.
The same difference applies the other way round: Ryza Rust is much 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 Ryza Rust on the colour wheel See Desert Brown on the colour wheel
All matches: Ryza Rust equivalents · Desert Brown equivalents