ΔE 7.7, close: similar, with a visible difference side by side. UK BSC is a little darker, more muted than Putrid Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). UK BSC is a little darker, more muted than Putrid Green.
The same difference applies the other way round: Putrid Green is a little lighter, more saturated.
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 Putrid Green on the colour wheel See UK BSC on the colour wheel
All matches: Putrid Green equivalents · UK BSC equivalents