ΔE 11.6, fair: the same colour family, but not a straight swap. Blue Base is more saturated, warmer than Thunderous Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Blue Base is more saturated, warmer than Thunderous Blue.
The same difference applies the other way round: Thunderous Blue is more muted, 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 Thunderous Blue on the colour wheel See Blue Base on the colour wheel
All matches: Thunderous Blue equivalents · Blue Base equivalents