ΔE 8.7, close: similar, with a visible difference side by side. Cadian Fleshtone is a little lighter, more saturated than Earth. They are different kinds of paint: AMMO by Mig Earth is an ink, glaze or transparent paint and Citadel Cadian Fleshtone is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Cadian Fleshtone is a little lighter, more saturated than Earth. They are different kinds of paint.
The same difference applies the other way round: Earth is a little darker, 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 Earth on the colour wheel See Cadian Fleshtone on the colour wheel
All matches: Earth equivalents · Cadian Fleshtone equivalents