Baby Blue vs Aquamarine

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Aquamarine is a little lighter, more saturated than Baby Blue.

Can I use Aquamarine instead of Baby Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aquamarine is a little lighter, more saturated than Baby Blue.

Can I use Baby Blue instead of Aquamarine?

The same difference applies the other way round: Baby Blue is a little darker, more muted.

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.