Afterburner vs Forged Red

How close are they?

ΔE 21.5, loose: different enough that you should pick on purpose. Forged Red is a little lighter, more saturated, cooler than Afterburner.

Can I use Forged Red instead of Afterburner?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Forged Red is a little lighter, more saturated, cooler than Afterburner.

Can I use Afterburner instead of Forged Red?

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