ΔE 12.9, fair: the same colour family, but not a straight swap. Khaki Drill is a little darker, more muted than Transparent Brown Iron Oxide. They are different kinds of paint: Golden Transparent Brown Iron Oxide is an ink, glaze or transparent paint and Vallejo Khaki Drill is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Khaki Drill is a little darker, more muted than Transparent Brown Iron Oxide. They are different kinds of paint.
The same difference applies the other way round: Transparent Brown Iron Oxide is a little 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 Transparent Brown Iron Oxide on the colour wheel See Khaki Drill on the colour wheel
All matches: Transparent Brown Iron Oxide equivalents · Khaki Drill equivalents