I would assume the 19 is more likely to have a battery produced after the code 36 problem was identified and corrected, thus minimizing the risk of buying a machine with that defect.
Aside from that concern, I'm not really sure there is an argument to pay more for an identical machine.
If you can get the last 3 digits of the VIN for each bike, there are guys here that can tell you if there will be a propensity for problems for the respective models.