ΔE 5.5, very close: most people won’t see a difference side by side. WWI German Grey-Green Primer is a little lighter, cooler than RAF Sky / FS 34424.
Yes, for most jobs. Very close match (ΔE 5). WWI German Grey-Green Primer is a little lighter, cooler than RAF Sky / FS 34424.
The same difference applies the other way round: RAF Sky / FS 34424 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 RAF Sky / FS 34424 on the colour wheel See WWI German Grey-Green Primer on the colour wheel
All matches: RAF Sky / FS 34424 equivalents · WWI German Grey-Green Primer equivalents