ΔE 17.4, loose: different enough that you should pick on purpose. Bastion Grey is noticeably lighter, warmer than Woodland Camo.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Bastion Grey is noticeably lighter, warmer than Woodland Camo.
The same difference applies the other way round: Woodland Camo is noticeably darker, 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 Woodland Camo on the colour wheel See Bastion Grey on the colour wheel
All matches: Woodland Camo equivalents · Bastion Grey equivalents