Choices Quotes in Dark Matter

How we cite our quotes: (Chapter.Paragraph)

Quote #10

This man and I were the same person up until a month ago. Which means ninety-nine-point-nine percent of our history is shared. (13.457-458)

In other words, all of these Jasons have made ninety-nine-point-nine percent of the same choices in their lives. So why do they act so differently? Are they different people at their cores? Or are they more or less the same guy? What do you think?