Light Sky Blue vs Bright Sapphire

How close are they?

ΔE 8.3, close: similar, with a visible difference side by side. Bright Sapphire is a little lighter than Light Sky Blue.

Can I use Bright Sapphire instead of Light Sky Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Bright Sapphire is a little lighter than Light Sky Blue.

Can I use Light Sky Blue instead of Bright Sapphire?

The same difference applies the other way round: Light Sky Blue is a little darker.

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.