I have moved content from "another site" to Hub Pages. What I do is this. First I copy all of the content into a Google Docs file - then I title it. I then delete the content from "site 1".
The following day I check the content from the Google doc at http://www.dustball.com/cs/plagiarism.checker/ which is a free plagiarism checker. Once it "clears" dustball I then post it to Hub pages. It usually takes between 24 and 72 hours depending on where you are "moving" it from.
I do NOT do this with my blog however as I feel that I can get more "bang" for my buck by contributing a good Hub on the same title and linking it to my blog.