Incursion Orange vs Sulfide Yellow

How close are they?

ΔE 31.7, loose: different enough that you should pick on purpose. Sulfide Yellow is a little lighter, much more muted, cooler than Incursion Orange.

Can I use Sulfide Yellow instead of Incursion Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Sulfide Yellow is a little lighter, much more muted, cooler than Incursion Orange.

Can I use Incursion Orange instead of Sulfide Yellow?

The same difference applies the other way round: Incursion Orange is a little darker, much more saturated, warmer.

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.