ΔE 14.4, fair: the same colour family, but not a straight swap. Reikland Fleshshade is noticeably lighter, more muted than Rust Tone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Reikland Fleshshade is noticeably lighter, more muted than Rust Tone.
The same difference applies the other way round: Rust Tone is noticeably darker, 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 Rust Tone on the colour wheel See Reikland Fleshshade on the colour wheel
All matches: Rust Tone equivalents · Reikland Fleshshade equivalents