Thunderous Blue vs Light Gray

How close are they?

ΔE 14.0, fair: the same colour family, but not a straight swap. Light Gray is a little lighter, more muted, cooler than Thunderous Blue.

Can I use Light Gray instead of Thunderous Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Gray is a little lighter, more muted, cooler than Thunderous Blue.

Can I use Thunderous Blue instead of Light Gray?

The same difference applies the other way round: Thunderous Blue is a little darker, 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.