With SQL Server 2008 and 2008 R2, the SSIS version is the same than SQL Server Integration Services 10.0.
With SQL Server 2005, the SSIS version is not contained in the service name. To get this information, you must check directly in the MsDtsSrvr.exe file.
How to know your package version?
The old method to search the SSIS Package version is to open the .dtsx file and find the XML markup
<DTS: Property DTS:Name=”PackageFormatVersion”>
Now, with the SSISDB catalog, you can run the query:
SELECT [name] ,[package_format_version] FROM [SSISDB].[catalog].[packages]
I hope this can help you in your work!