I am not sure, whether my finding is true to all the list in SharePoint 2013, all column name specification or format is entirely different then its predecessor.
If you are hard code developer and familiar with inserting/deleting/ and updating the item through APIs, you might seen the columns name that comes with space between word.
Example, Employee Name (Display Name) When you deal this column in code,
The SharePoint 2010, change this column to Employee_x200_Name for identifying uniquely with in the list.
In SharePoint 2013,I create the list based on the List template, and noticed the internal name was entirely different, and SP2013 generates the internal name with random of four alphabetic