Odoo What is the difference between odoo snippets v8 and v9

want to upgrade to odoo 9, I am still new in odd web development.

the xpath in my snippets is :

    <xpath expr="//div[@class='tab-content']" position="inside">

It’s stays the same or do I add

    //div[@id='snippet_content']

before the div class

in Odoo 9 :

<xpath expr="//div[@id='snippet_structure']/div[@class='o_panel_body']" position="inside">

reference link

http://stackoverflow.com/questions/37114352/what-is-the-difference-between-odoo-snippets-v8-and-v9