Deep Orange vs Incursion Orange

How close are they?

ΔE 16.8, loose: different enough that you should pick on purpose. Incursion Orange is a little lighter, more saturated, warmer than Deep Orange.

Can I use Incursion Orange instead of Deep Orange?

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

Can I use Deep Orange instead of Incursion Orange?

The same difference applies the other way round: Deep Orange is a little darker, more muted, 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.