Bright Red vs Ragweed Orange

How close are they?

ΔE 17.2, loose: different enough that you should pick on purpose. Ragweed Orange is much more saturated, warmer than Bright Red.

Can I use Ragweed Orange instead of Bright Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Ragweed Orange is much more saturated, warmer than Bright Red.

Can I use Bright Red instead of Ragweed Orange?

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