Field Grey Shadow FS-34086 vs Dark Reaper

How close are they?

ΔE 13.1, fair: the same colour family, but not a straight swap. Dark Reaper is cooler than Field Grey Shadow FS-34086.

Can I use Dark Reaper instead of Field Grey Shadow FS-34086?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Reaper is cooler than Field Grey Shadow FS-34086.

Can I use Field Grey Shadow FS-34086 instead of Dark Reaper?

The same difference applies the other way round: Field Grey Shadow FS-34086 is 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.