ΔE 16.1, loose: different enough that you should pick on purpose. UK BSC is a little lighter, more muted, warmer than Cockpit Color Nakajima.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). UK BSC is a little lighter, more muted, warmer than Cockpit Color Nakajima.
The same difference applies the other way round: Cockpit Color Nakajima is a little darker, more saturated, cooler.
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 Cockpit Color Nakajima on the colour wheel See UK BSC on the colour wheel
All matches: Cockpit Color Nakajima equivalents · UK BSC equivalents