Check the journal u considering sending to.
Sincerely I dont even know the differences. But I use ENDNOTE which is a kind of software that is connected to the word document and when I quote something from a journal, I just go to endnote..and then ask to cite it. it cites the journal per the way it is cited on pubmed and it puts the references in order for me. When I discovered it...I thought it was so cool