You are right ! You can change the S for a P (pinstripe) and you would get the same result. Since you are crossing a co-dom combo (pastel + something) with a base morph (pastel).
I am not sure I understand what you are saying about the bumblebee gene and pastel gene together ??
I think you are mixing the "gene" and the "allele" together.
From :
http://www.newenglandreptile.com/genetics_intro.html
Gene - unit of heredity that determines the characteristics of the offspring.
Genotype – an organism’s genetic composition. Heredity - the transmission of genetic characters from parents to offspring.
Locus - a gene's position on a chromosome (plural: loci)
Allele - either of the two paired genes which affect an inheritable trait.
Codominant - a gene that causes the homozygous form to look different than the wild-type and the heterozygous form to have traits of both.
Dominant - a gene that causes an animal to look different than the wild-type and where the homozygous form and the heterozygous form look the same as each other.
Het – an abbreviation for heterozygous.
Heterozygous – possessing two different genes for a given trait. An animal with one mutated, recessive gene still appears normal; its mutated gene can be inherited by future offspring. A codominant animal is heterozygous for the dominant form of its mutated gene, yet is different in appearance than both the wild-type and homozygous forms.
Homozygous – A state in which both genes for a specific trait are the same. When a recessive gene is it its homozygous form, it makes the animal look different from the wild-type. When a dominant gene is in its homozygous state, it causes the animal to look different from both the wild-type and the heterozygous (codominant) forms.
I think you should read the entire definitions if you haven't yet.
and the part on "punnet square" and with co-dom and dominant
http://www.newenglandreptile.com/genetics_codom.html
What is actually a pastel ball python ? It's a ball python made a multiple gene know as normal where on one pair of chromosome (locus) it's have one pastel gene. That mean, on that particular locus, one allele is Pastel and the other one is Normal. Same thing goes for a spider or pinstripe but the genes are on a different locus.
What is a super pastel ? It's a snake with multiple gene that on one locus, it's have 2 alleles of the Pastel gene. Meaning one is pastel, and the other one is pastel, there is no normal gene on that locus.
Super pastel should be seen as Albino and Pastel as het Albino.