There is no such thing as a Het. Spider.

Nor is there any Het. Co-dominant traits. (Heterozygous only applies non-visually to recessive traits. If a Co-Dominant animal is Heterozygous, it displays that trait and it's super form is Homozygous).

So, if there is a 'normal' ball python hatchling from a Co-Dominant breeding, it is just that, normal. (this includes Pastels, Mojaves, Spiders, Pinstripes, Fires, Lessers, Butters, and all other co-dom traits).