ΔE 11.9, fair: the same colour family, but not a straight swap. Violet Vamp is a little darker, more muted, warmer than Cygnar Blue Base.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Violet Vamp is a little darker, more muted, warmer than Cygnar Blue Base.
The same difference applies the other way round: Cygnar Blue Base is a little lighter, more saturated, 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.
See Cygnar Blue Base on the colour wheel See Violet Vamp on the colour wheel
All matches: Cygnar Blue Base equivalents · Violet Vamp equivalents