I would lay odds on both descending from the Modelo culture. A lot of the differences we see between yeast propagators can be put down to the fact that all yeast cultures are plated for singles, often from a culture that contains variants. We also do not know how far away from the reference culture a plated culture is when a new propagator is plating for singles. The chosen colony can make a difference in a yeast culture. However, most variants perform very close to the original strain.