Royal Blue vs Bright Blue

How close are they?

ΔE 12.7, fair: the same colour family, but not a straight swap. Bright Blue is more saturated, warmer than Royal Blue.

Can I use Bright Blue instead of Royal Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Bright Blue is more saturated, warmer than Royal Blue.

Can I use Royal Blue instead of Bright Blue?

The same difference applies the other way round: Royal 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.