Fiery Vermilion vs Ember Orange

How close are they?

ΔE 12.9, fair: the same colour family, but not a straight swap. Ember Orange is noticeably lighter, more saturated than Fiery Vermilion.

Can I use Ember Orange instead of Fiery Vermilion?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ember Orange is noticeably lighter, more saturated than Fiery Vermilion.

Can I use Fiery Vermilion instead of Ember Orange?

The same difference applies the other way round: Fiery Vermilion is noticeably 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.