When the game saves the game records all the data so you need to finish the chapter you are on and then go to the next 1 in a different version or start the chapter over when the campaign is updated.
Think of it this way I am playing a map called Deadwater Drop I save my game it does save my gold and items.
I want to load Dead Man's Chest with that save file so I can get my gold and items. Since they are different maps it wouldn't work. It's the same basic deal here the campaign versions are similar but they are Different. They both save the same kind of data between chapters so 1 version can read the other versions end of chapter files but it cant load your current objects into a modified version of the map mid chapter.
I hope that clears up your question