ΔE 19.0, loose: different enough that you should pick on purpose. UK BSC is noticeably darker, more muted, warmer than Pestilence Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). UK BSC is noticeably darker, more muted, warmer than Pestilence Green.
The same difference applies the other way round: Pestilence Green is noticeably lighter, 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 Pestilence Green on the colour wheel See UK BSC on the colour wheel
All matches: Pestilence Green equivalents · UK BSC equivalents