Aqua Alchemy vs Bright Jade

How close are they?

ΔE 8.6, close: similar, with a visible difference side by side. Bright Jade is a little darker, more muted than Aqua Alchemy.

Can I use Bright Jade instead of Aqua Alchemy?

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

Can I use Aqua Alchemy instead of Bright Jade?

The same difference applies the other way round: Aqua Alchemy 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.