ΔE 11.8, fair: the same colour family, but not a straight swap. Orange Rust is a little darker, warmer than Dwarf Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Orange Rust is a little darker, warmer than Dwarf Flesh.
The same difference applies the other way round: Dwarf Flesh is a little lighter, cooler.
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 Dwarf Flesh on the colour wheel See Orange Rust on the colour wheel
All matches: Dwarf Flesh equivalents · Orange Rust equivalents