Flak Gun Yellow vs Panzer Yellow

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Panzer Yellow is noticeably darker than Flak Gun Yellow.

Can I use Panzer Yellow instead of Flak Gun Yellow?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Panzer Yellow is noticeably darker than Flak Gun Yellow.

Can I use Flak Gun Yellow instead of Panzer Yellow?

The same difference applies the other way round: Flak Gun Yellow 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.