ΔE 12.3, fair: the same colour family, but not a straight swap. German Yellow is a little lighter, cooler than Khaki.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). German Yellow is a little lighter, cooler than Khaki.
The same difference applies the other way round: Khaki is a little darker, 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.
See Khaki on the colour wheel See German Yellow on the colour wheel
All matches: Khaki equivalents · German Yellow equivalents