I am personally aware about the history when as little as several sentences from the introduction of the own article has been reused in another article (not even results or conclusions). The history became public, dragging various of events that were not very severe but unpleasant enough to avoid.
So I suggest better not to do this. Of course, this also depends on the policies of the both journals but most of them disallow duplicate content. To make the long story short, it might be sad consequences.