Field Grey FS-34159 vs Venom Wyrm

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Venom Wyrm is a little darker, warmer than Field Grey FS-34159.

Can I use Venom Wyrm instead of Field Grey FS-34159?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Venom Wyrm is a little darker, warmer than Field Grey FS-34159.

Can I use Field Grey FS-34159 instead of Venom Wyrm?

The same difference applies the other way round: Field Grey FS-34159 is a little lighter, 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.