I've been struggling to find a plugin which would assist in creating duplicated content from one post to the next with minor edits required.
I tried a couple of the WordPress specific plugins "Post Template" and "Templatedia" but found them each to have some nuisances for continual use.
I stumbled upon AutoHotKey which includes Hotstrings which I now find to be the easiest way to recreate a previous post. With a little massaging it is very easy to create a Hotstring which is very similar to MS Words autocorrect feature.
Whilst it is not a WordPress plugin, I thought I'd mention it here as I couldn't find any other reference to AutoHotKey. More importantly it is a free product.
The webpage is http://www.autohotkey.com