Are the Outlook 2013 PST and data files identical to Outlook 2010 files?

Are the Outlook 2013 PST and data files identical to Outlook 2010 files?

I installed Office 2013 while keeping my Office 2010 installation intact.  I hate the new look & feel of Outlook 2013 and I want to go back to using Outlook 2010.  But I am concerned that since I allowed Outlook 2013 to use the same PST file in My Documents
/ Outlook Files, it might have modified the PST file to make it incompatible with Outlook 2010.  I haven't tried it yet, I am being cautious.  Does Outlook 2013 make any changes to the structure of the Outlook data files?

Keys to the Problem Are the Outlook 2013 PST and data files identical to Outlook 2010 files?

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