Some of the navigation at the bottom of the pages is different, again on some pages.
That's trivial. Just chop it off-- you can find a script to do that* --and reapply something global. It's the meat of the pages that will be the problem. I'll bet you have style names that mean one thing on one page and something entirely different on another page.
* She said, glibly, although I haven't even got one of those clever text editors that can change a bunch of files concurrently without opening them. I just keep telling people they exist, no problem, everyone else can find one.