ΔE 46.9, loose: different enough that you should pick on purpose. Aether Blue is noticeably lighter, much more saturated, cooler than Agrax Earthshade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Aether Blue is noticeably lighter, much more saturated, cooler than Agrax Earthshade.
The same difference applies the other way round: Agrax Earthshade is noticeably darker, much 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 Aether Blue on the colour wheel
All matches: Agrax Earthshade equivalents · Aether Blue equivalents