ΔE 13.6, fair: the same colour family, but not a straight swap. Olive Green is noticeably darker, more muted, warmer than Venom Wyrm.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Olive Green is noticeably darker, more muted, warmer than Venom Wyrm.
The same difference applies the other way round: Venom Wyrm 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 Venom Wyrm on the colour wheel See Olive Green on the colour wheel
All matches: Venom Wyrm equivalents · Olive Green equivalents