ΔE 26.5, loose: different enough that you should pick on purpose. Hellion Red Wash is noticeably lighter, more saturated, cooler than Agrax Earthshade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Hellion Red Wash is noticeably lighter, more saturated, cooler than Agrax Earthshade.
The same difference applies the other way round: Agrax Earthshade is noticeably darker, more muted, 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 Agrax Earthshade on the colour wheel See Hellion Red Wash on the colour wheel
All matches: Agrax Earthshade equivalents · Hellion Red Wash equivalents