Below are two entries from some log files on a website that I
maintain.  I am trying to figure out if they are from the same
computer.  I note that the IP addresses are different, but both
resolve to "AT&T Internet Services", to separate servers within about
20 miles of the person's home address who I believe is responsible for
the entries.  I also note that the user agents are identical.  I
searched through 22 days of log files and can not find another user
agent that matches exactly.  I don't have much experience deciphering
this kind of thing and am looking for correlation of my findings.

(I took the liberty of obscuring the website name and host ip address)

2010-08-17 23:29:09 W3SVC46816626 NTXPWUS69 74.xxx.xxx.145 POST
/contact.asp - 80 - 70.225.137.151 HTTP/1.1
Mozilla/5.0+(Macintosh;+U;+Intel+Mac+OS+X+10.5;+en-US;+rv:1.9.2.8)+Gecko/20=
100722+Firefox/3.6.8
- http://thewebsitename.org/ thewebsitename.org 302 0 0 414 738 10843

2010-08-28 23:36:53 W3SVC46816626 NTXPWUS69 74.xxx.xxx.145 POST
/contact.asp - 80 - 76.251.230.168 HTTP/1.1
Mozilla/5.0+(Macintosh;+U;+Intel+Mac+OS+X+10.5;+en-US;+rv:1.9.2.8)+Gecko/20=
100722+Firefox/3.6.8
- http://thewebsitename.org/ thewebsitename.org 302 0 0 414 2174 10578

Aaron
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