ΔE 26.6, loose: different enough that you should pick on purpose. Primer Taupe is noticeably lighter, much more muted, cooler than Agrellan Earth.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Primer Taupe is noticeably lighter, much more muted, cooler than Agrellan Earth.
The same difference applies the other way round: Agrellan Earth is noticeably darker, much 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 Agrellan Earth on the colour wheel See Primer Taupe on the colour wheel
All matches: Agrellan Earth equivalents · Primer Taupe equivalents