This appears to be evidence that EXAMINER and EXCELLO were the same ship.
See this page from the website Shipbuilding History, http://shipbuildinghistory.com/history/shipyards/4emergency/wwone/aisc.htm, and scroll down to hull #1484. This is a list of ships built by American International Shipbuilding Corp. of Philadelphia. A ship originally named CINNEBAR/SINSINAWA (I have no idea why a ship would have two "original" names) was delivered for service in October 1919. She was later renamed EXAMINER in 1928, then renamed again EXCELLO in 1941, before being torpedoed and lost in 1942.
That's probably as good a reference as you will be able to find.
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