Orange Magma vs Yellow Flame

How close are they?

ΔE 16.4, loose: different enough that you should pick on purpose. Yellow Flame is a little lighter, more saturated, cooler than Orange Magma.

Can I use Yellow Flame instead of Orange Magma?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Yellow Flame is a little lighter, more saturated, cooler than Orange Magma.

Can I use Orange Magma instead of Yellow Flame?

The same difference applies the other way round: Orange Magma 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.