ΔE 15.1, loose: different enough that you should pick on purpose. Lupercal Green is noticeably darker, more saturated, cooler than Dark Olive Green FS-34130.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Lupercal Green is noticeably darker, more saturated, cooler than Dark Olive Green FS-34130.
The same difference applies the other way round: Dark Olive Green FS-34130 is noticeably lighter, 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 Dark Olive Green FS-34130 on the colour wheel See Lupercal Green on the colour wheel
All matches: Dark Olive Green FS-34130 equivalents · Lupercal Green equivalents