Glowing Inferno vs Yellow FS13538

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Yellow FS13538 is more saturated than Glowing Inferno.

Can I use Yellow FS13538 instead of Glowing Inferno?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Yellow FS13538 is more saturated than Glowing Inferno.

Can I use Glowing Inferno instead of Yellow FS13538?

The same difference applies the other way round: Glowing Inferno is more muted.

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.