All versions use the same data engine for slicing and displaying the data. All versions also use an internal Excel engine which avoids the need for any MS drivers or installation of MS Office.
The PRO version has been created for those who wish to analyse data and also distribute interactive analyses (Dashboards) to other users.
The STD version just leaves out the Dashboard feature and so is aimed at those who conduct the data manipulation.
1Note that importing from ODBC, SQL Server or MS Access Databases require appropriate drivers to be installed on the machine