I'm glad you're enjoying it! :)
I think you mean Act 3? It's different for a few reasons, partly because there needed to be a large shift in the game world to give the war some stakes, partly because I'm having to recreate all the scenes again (too many characters with too many physical changes to reuse old assets) and partly because I have to keep the game's filesize below 2GB or else Android players won't be able to install it.
Also, huge filesizes just aren't fair on people with data caps :)