ΔE 55.3, loose: different enough that you should pick on purpose. Ink Magenta is noticeably darker, more muted, cooler than Matt Light Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 55). Ink Magenta is noticeably darker, more muted, cooler than Matt Light Rust.
The same difference applies the other way round: Matt Light Rust is noticeably lighter, 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 Matt Light Rust on the colour wheel See Ink Magenta on the colour wheel
All matches: Matt Light Rust equivalents · Ink Magenta equivalents