Whale Grey vs Etherium Blue

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Etherium Blue is more saturated than Whale Grey.

Can I use Etherium Blue instead of Whale Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Etherium Blue is more saturated than Whale Grey.

Can I use Whale Grey instead of Etherium Blue?

The same difference applies the other way round: Whale Grey is 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.