Mythical Orange vs Vat Orange

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Vat Orange is more saturated than Mythical Orange.

Can I use Vat Orange instead of Mythical Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Vat Orange is more saturated than Mythical Orange.

Can I use Mythical Orange instead of Vat Orange?

The same difference applies the other way round: Mythical Orange 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.