SQL Server 2008 R2 service packs are cumulative and can be used to upgrade all releases of SQL Server 2008 R2 to Service Pack 3. SQL Server 2008 R2 Service Pack 3 contains Cumulative Update 1 to 13 from SQL Server 2008 R2 SP2. The package can be used to upgrade the following SQL Server 2008 R2 editions:

SQL Server 2008 R2 Parallel Computing Edition

SQL Server 2008 R2 Datacenter Edition

SQL Server 2008 R2 Enterprise Edition and Developer Edition

SQL Server 2008 R2 Standard Edition

SQL Server 2008 R2 Web Edition

SQL Server 2008 R2 Workgroup Edition

Please read:

http://www.microsoft.com/en-us/download/details.aspx?id=44271

Cheers.