ΔE 15.2, loose: different enough that you should pick on purpose. Skrag Brown is a little darker, much more muted than Light Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Skrag Brown is a little darker, much more muted than Light Rust.
The same difference applies the other way round: Light Rust is a little 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 Light Rust on the colour wheel See Skrag Brown on the colour wheel
All matches: Light Rust equivalents · Skrag Brown equivalents