ΔE 15.4, loose: different enough that you should pick on purpose. Tan Earth is a little darker, much more saturated than Pilgrim Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Tan Earth is a little darker, much more saturated than Pilgrim Grey.
The same difference applies the other way round: Pilgrim Grey is a little lighter, much more muted.
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 Pilgrim Grey on the colour wheel See Tan Earth on the colour wheel
All matches: Pilgrim Grey equivalents · Tan Earth equivalents