ΔE 20.7, loose: different enough that you should pick on purpose. German Yellow is noticeably darker, warmer than Afterglow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). German Yellow is noticeably darker, warmer than Afterglow.
The same difference applies the other way round: Afterglow is noticeably lighter, 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 Afterglow on the colour wheel See German Yellow on the colour wheel
All matches: Afterglow equivalents · German Yellow equivalents