rish3 - 1:45 am on Aug 2, 2013 (gmt 0)
That first part, UA-1234567, if you keep all your sites in the same analytics account, is the same. And, it's in their cache, so Google doesn't have to do anything special to identify a shared network of sites.
The easy way 'round with analytics is just to create different user ids for each site you put into Analytics, then grant them all access to a single account. That's safe enough, unless you think the they are pulling account data for SERP ranking purposes.
The similar issue with adsense publisher ids is a little harder to work around, but there's a couple of strategies that work.