You made some good points, especially about long-term blood lines - which are rarely pure in the Pet industry.

Yes, my snake is likely a cross, but I still that if it were a Sinaloan x Pueblan mix, versus Sinaloan x Guatemalan mix, pale bands would be wider.

Ultimately - nobody knows and nobody will unless I have DNA testing done.

(When independent researchers actually tested fish DNA in the Portland-Seattle area a few years back, taking many samples from various stores from three major Grocery Store chains, they found that 33% of all samples were wrongly labeled as a more expensive fish, for which a cheaper species has been substituted.)