Yes, you can have both suites in your toolbox. Please add the missing controls manually and let me know whether this helps.
Adding RadControls for ASP.NET (Classic) to the Visual Studio 2008 Toolbox
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.