New or newest source for upgrade - frequent link seen or update center different?

Some posts show a link to the latest version of Norton 360 (Standard Edition) usually given as ...n360s_5.  There is also the update center at updatecenter.norton.com.  Do these always link to the absolute most recent up-to-date Norton 360, or is one of them more up-to-date than the other? 

 

A recent upgrade to one machine on my account was an installer of about 116 MB (?) of N360-ESD-18-...something..., downloaded rom the n360s_5 link, and after installing the version 5 of Norton 360,  the LiveUpdate action downloaded and installed some 122 MB as the first LiveUpdate.  This seems large if that n360s_5 were the most recently available package from Norton-Symantec.  Would the Update Center have a more recent installer?