Yoda Green vs Emerald

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Emerald is noticeably darker, more saturated, cooler than Yoda Green.

Can I use Emerald instead of Yoda Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Emerald is noticeably darker, more saturated, cooler than Yoda Green.

Can I use Yoda Green instead of Emerald?

The same difference applies the other way round: Yoda Green is noticeably 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.