Russian Blue vs Dark Reaper

How close are they?

ΔE 10.1, fair: the same colour family, but not a straight swap. Dark Reaper is a little darker, warmer than Russian Blue.

Can I use Dark Reaper instead of Russian Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Reaper is a little darker, warmer than Russian Blue.

Can I use Russian Blue instead of Dark Reaper?

The same difference applies the other way round: Russian Blue 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.