ΔE 27.2, loose: different enough that you should pick on purpose. Leather Brown is noticeably darker, much more muted than Ryza Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Leather Brown is noticeably darker, much more muted than Ryza Rust.
The same difference applies the other way round: Ryza Rust is noticeably lighter, much more saturated.
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 Leather Brown on the colour wheel
All matches: Ryza Rust equivalents · Leather Brown equivalents