ΔE 5.2, very close: most people won’t see a difference side by side. Russian AF Grey N.4 is a little darker than IJA #1 Hairyokushoku (Grey-Green).
Yes, for most jobs. Very close match (ΔE 5). Russian AF Grey N.4 is a little darker than IJA #1 Hairyokushoku (Grey-Green).
The same difference applies the other way round: IJA #1 Hairyokushoku (Grey-Green) is a little 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 IJA #1 Hairyokushoku (Grey-Green) on the colour wheel See Russian AF Grey N.4 on the colour wheel
All matches: IJA #1 Hairyokushoku (Grey-Green) equivalents · Russian AF Grey N.4 equivalents