Magic Green vs Aqua Alchemy

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Aqua Alchemy is a little darker, more muted than Magic Green.

Can I use Aqua Alchemy instead of Magic Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aqua Alchemy is a little darker, more muted than Magic Green.

Can I use Magic Green instead of Aqua Alchemy?

The same difference applies the other way round: Magic Green is a little lighter, more saturated.

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.