ΔE 16.7, loose: different enough that you should pick on purpose. Agrax Earthshade is a little lighter, more muted, warmer than Strong Skin Shade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Agrax Earthshade is a little lighter, more muted, warmer than Strong Skin Shade.
The same difference applies the other way round: Strong Skin Shade is a little darker, more saturated, cooler.
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 Strong Skin Shade on the colour wheel See Agrax Earthshade on the colour wheel
All matches: Strong Skin Shade equivalents · Agrax Earthshade equivalents