ΔE 14.3, fair: the same colour family, but not a straight swap. Dark Reaper is noticeably darker, more muted, cooler than Aggressor Blue FS 35109.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Reaper is noticeably darker, more muted, cooler than Aggressor Blue FS 35109.
The same difference applies the other way round: Aggressor Blue FS 35109 is noticeably lighter, more saturated, 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.
See Aggressor Blue FS 35109 on the colour wheel See Dark Reaper on the colour wheel
All matches: Aggressor Blue FS 35109 equivalents · Dark Reaper equivalents