Phoenix Flames vs Blazing Yellow

How close are they?

ΔE 18.4, loose: different enough that you should pick on purpose. Blazing Yellow is a little lighter, more saturated, cooler than Phoenix Flames.

Can I use Blazing Yellow instead of Phoenix Flames?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Blazing Yellow is a little lighter, more saturated, cooler than Phoenix Flames.

Can I use Phoenix Flames instead of Blazing Yellow?

The same difference applies the other way round: Phoenix Flames is a little darker, more muted, 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.