Mythical Orange vs Orange

How close are they?

ΔE 17.7, loose: different enough that you should pick on purpose. Orange is a little lighter, more muted, warmer than Mythical Orange.

Can I use Orange instead of Mythical Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Orange is a little lighter, more muted, warmer than Mythical Orange.

Can I use Mythical Orange instead of Orange?

The same difference applies the other way round: Mythical Orange is a little darker, more saturated, cooler.

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.