Ground Brown vs Earth Green (Early)

How close are they?

ΔE 19.4, loose: different enough that you should pick on purpose. Earth Green (Early) is a little darker, more saturated, cooler than Ground Brown.

Can I use Earth Green (Early) instead of Ground Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Earth Green (Early) is a little darker, more saturated, cooler than Ground Brown.

Can I use Ground Brown instead of Earth Green (Early)?

The same difference applies the other way round: Ground Brown is a little lighter, 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.