Either they will be the same or the ports will be an hour ahead of the ship. It depends on the captain whether or not the ship will change times. Some captains will make the change and other of the same line won't.
But any good excursion company would know when a ship is both arriving and derparting from the port.
Akumal Mexico Reviews
Star Princess 2005, Sun Princess 2005
Caribbean Princess 2006, MSC Lirica 2006 , NCL Pearl 2007, Majesty of the Seas 2008, Carnival Destiny 2008, MSC Lirica 2009, Carnival Valor 2009,Carnival Legend 2010, Carnival Liberty 2010,Carnival Fantsay 2011,Carnival Valor Feb 2012, MSC Poesia Dec 2012, MSC Poesia April 2013