Aqua Alchemy vs Yoda Green

How close are they?

ΔE 28.5, loose: different enough that you should pick on purpose. Yoda Green is noticeably darker, much more muted, warmer than Aqua Alchemy.

Can I use Yoda Green instead of Aqua Alchemy?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Yoda Green is noticeably darker, much more muted, warmer than Aqua Alchemy.

Can I use Aqua Alchemy instead of Yoda Green?

The same difference applies the other way round: Aqua Alchemy is noticeably lighter, much 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.