Enoch is the same person througout... (Score 1)

NealStephenson: ... It's largely a family saga kind of connection. And then there's a character, Enoch Root, who possesses unnatural longevity and shows up in person in both of the books.

Q: So it is the same Enoch Root in both of the books?

NealStephenson: Yes

Taken from a 2003 interview of Neal. http://www.scifidimensions.com/Oct03/nealstephenso n.htm