ΔE 10.5, fair: the same colour family, but not a straight swap. Light Rust is a little darker, more saturated than Tanned Shadow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Light Rust is a little darker, more saturated than Tanned Shadow.
The same difference applies the other way round: Tanned Shadow is a little lighter, more muted.
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 Tanned Shadow on the colour wheel See Light Rust on the colour wheel
All matches: Tanned Shadow equivalents · Light Rust equivalents