ΔE 18.9, loose: different enough that you should pick on purpose. Imperial Gold is noticeably lighter, warmer than All That Glitters.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Imperial Gold is noticeably lighter, warmer than All That Glitters.
The same difference applies the other way round: All That Glitters is noticeably darker, 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.
See All That Glitters on the colour wheel See Imperial Gold on the colour wheel
All matches: All That Glitters equivalents · Imperial Gold equivalents