SQL2005 Database on SQL Server 2008 R2 performance

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SQL-Server-2005

SQL-Server

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Scenario:

We are using SQL2005 driver when creating SQL connection to SqlServer 2008 R2 via NHibernate

configuration = new Configuration().SetProperty(Environment.ReleaseConnections, "after_transaction")
                .SetProperty(Environment.Dialect, typeof(MsSql2005Dialect).AssemblyQualifiedName)
                .SetProperty(Environment.ConnectionDriver,
                             typeof(SqlClientDriver).AssemblyQualifiedName)
                .SetProperty(Environment.ProxyFactoryFactoryClass,
                             typeof(ProxyFactoryFactory).AssemblyQualifiedName)
                .SetProperty(Environment.ConnectionString, ConnectionProvider.GetConnectionString());

Question:

Will I get the same performance as when using MsSql2008Dialect, or to be more precise does database created in Sql2005 and Sql2008 server have same performances under SqlServer 2008 R2?