ΔE 23.4, loose: different enough that you should pick on purpose. Imperial Gold is noticeably darker, much more muted than Afterburner.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Imperial Gold is noticeably darker, much more muted than Afterburner.
The same difference applies the other way round: Afterburner is noticeably lighter, 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.
See Afterburner on the colour wheel See Imperial Gold on the colour wheel
All matches: Afterburner equivalents · Imperial Gold equivalents