WWI German Fokker Grey vs IDF/IAF Green

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. IDF/IAF Green is a little darker, more saturated than WWI German Fokker Grey.

Can I use IDF/IAF Green instead of WWI German Fokker Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). IDF/IAF Green is a little darker, more saturated than WWI German Fokker Grey.

Can I use WWI German Fokker Grey instead of IDF/IAF Green?

The same difference applies the other way round: WWI German Fokker Grey is a little lighter, more muted.

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.