Dark Reaper vs Gray FS36231

How close are they?

ΔE 10.1, fair: the same colour family, but not a straight swap. Gray FS36231 is a little lighter, warmer than Dark Reaper.

Can I use Gray FS36231 instead of Dark Reaper?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Gray FS36231 is a little lighter, warmer than Dark Reaper.

Can I use Dark Reaper instead of Gray FS36231?

The same difference applies the other way round: Dark Reaper is a little darker, 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.