ΔE 14.8, fair: the same colour family, but not a straight swap. Hellion Red Wash is a little lighter, more muted, cooler than Reikland Fleshshade.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Hellion Red Wash is a little lighter, more muted, cooler than Reikland Fleshshade.
The same difference applies the other way round: Reikland Fleshshade is a little darker, 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 Reikland Fleshshade on the colour wheel See Hellion Red Wash on the colour wheel
All matches: Reikland Fleshshade equivalents · Hellion Red Wash equivalents