ΔE 15.4, loose: different enough that you should pick on purpose. Flaming Forge Orange is much more muted than Incursion Orange.
Can I use Flaming Forge Orange instead of Incursion Orange?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Flaming Forge Orange is much more muted than Incursion Orange.
Can I use Incursion Orange instead of Flaming Forge Orange?
The same difference applies the other way round: Incursion Orange is much more saturated.
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.