ΔE 3.8, very close: most people won’t see a difference side by side. Blue is a little lighter than Royal Blue.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Yes, for most jobs. Very close match (ΔE 4). Blue is a little lighter than Royal Blue.
The same difference applies the other way round: Royal Blue is a little darker.
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 Royal Blue on the colour wheel See Blue on the colour wheel
All matches: Royal Blue equivalents · Blue equivalents