ΔE 12.8, fair: the same colour family, but not a straight swap. Light Mustard Khaki is noticeably darker than Dunkelgelb DG I.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Light Mustard Khaki is noticeably darker than Dunkelgelb DG I.
The same difference applies the other way round: Dunkelgelb DG I is noticeably lighter.
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 Dunkelgelb DG I on the colour wheel See Light Mustard Khaki on the colour wheel
All matches: Dunkelgelb DG I equivalents · Light Mustard Khaki equivalents