ΔE 6.0, very close: most people won’t see a difference side by side. Medium Blue is a little darker, cooler than Flat Blue.
Yes, for most jobs. Very close match (ΔE 6). Medium Blue is a little darker, cooler than Flat Blue.
The same difference applies the other way round: Flat Blue is a little lighter, 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.
See Flat Blue on the colour wheel See Medium Blue on the colour wheel
All matches: Flat Blue equivalents · Medium Blue equivalents