Board Thread:News and Announcements/@comment-5557418-20140403003025/@comment-5557418-20140404000832

"When importing content you may come across pages at two different communities that have the same name. In this case one of the pages is going to have to be renamed BEFORE doing the export/import - you can't do it afterwards. A warning: If you forget to do this, the edit histories of both articles will get fused! Aside maybe from the rare case when the edit histories of the two articles don't overlap chronologically, it is going to be a big mess!"

Since both wikis have almost the same article names, this statement is going to be the main reason to why the merge will be difficult. So there'll be basically two pages of the same topic, we'll copy and excess information over to the base page, and then the renamed article will be removed.