ΔE 16.0, loose: different enough that you should pick on purpose. Ogryn Camo is a little lighter, much more saturated, cooler than Green FS 34258.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Ogryn Camo is a little lighter, much more saturated, cooler than Green FS 34258.
The same difference applies the other way round: Green FS 34258 is a little darker, much more muted, warmer.
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 Green FS 34258 on the colour wheel See Ogryn Camo on the colour wheel
All matches: Green FS 34258 equivalents · Ogryn Camo equivalents