Inferno Orange vs Sunset Orange

How close are they?

ΔE 17.1, loose: different enough that you should pick on purpose. Sunset Orange is a little lighter, more muted, warmer than Inferno Orange.

Can I use Sunset Orange instead of Inferno Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Sunset Orange is a little lighter, more muted, warmer than Inferno Orange.

Can I use Inferno Orange instead of Sunset Orange?

The same difference applies the other way round: Inferno 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.