Khador Red Base vs Bright Orange

How close are they?

ΔE 18.2, loose: different enough that you should pick on purpose. Bright Orange is much more muted, warmer than Khador Red Base.

Can I use Bright Orange instead of Khador Red Base?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Bright Orange is much more muted, warmer than Khador Red Base.

Can I use Khador Red Base instead of Bright Orange?

The same difference applies the other way round: Khador Red Base is much 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.