ΔE 15.8, loose: different enough that you should pick on purpose. Buckskin Pale is noticeably darker, more muted than Imp Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Buckskin Pale is noticeably darker, more muted than Imp Yellow.
The same difference applies the other way round: Imp Yellow is noticeably lighter, 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 Imp Yellow on the colour wheel See Buckskin Pale on the colour wheel
All matches: Imp Yellow equivalents · Buckskin Pale equivalents