my download lists for 11.8.3 are built from Release-To-Manufacturing Windows 7. WsusOfflineUpdates by default installs SP1 and then updates. my lists fill in the gaps. I had to do through it over the holidays to sort out superseded files in my lists.
so in short WOU and my lists will give you a complete uptodate system*
*about 20 updates have to be downloaded. they can not be downloaded beforehand using Windows Update Catulog.
in regards to the "old" and "new". I have now removed the old. that was historical. those lists will allow you to download the files. if MS removes those files then I have also uploaded the update ISOs to the OneDrive.
hope this make it easier to use.