ΔE 17.6, loose: different enough that you should pick on purpose. Baron Blue is much more saturated, warmer than French Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Baron Blue is much more saturated, warmer than French Blue.
The same difference applies the other way round: French Blue is much 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 French Blue on the colour wheel See Baron Blue on the colour wheel
All matches: French Blue equivalents · Baron Blue equivalents