[kbs666]

First, names don't conflict so you can import a dwarf article and it will sit happily alongside an existing dwarf article you already have (later imports of the same or updated material will overwrite the old import though and I've had spotty results with RW leaving my edits alone in that case so be forewarned). All imported content will at least have tags that let you know the source so you should be able to keep it straight. If you ever do find yourself with multiple topics/articles with the same name I'd add suffixes to the imported ones to let me know at a glance where they came from.

If you're inputting the data yourself the same advice applies, use suffixes to separate the topics/articles from different sources.