Glowing Inferno vs Marigold Yellow

How close are they?

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

Can I use Marigold Yellow instead of Glowing Inferno?

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

Can I use Glowing Inferno instead of Marigold Yellow?

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

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.