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I believe you installed AutoCAD Architecture 2009 with the first product reference. The second reference is for a suite called AutoCAD Revit Architecture Suite 2009 which includes AutoCAD Architecture 2009.
The answer really depends on the circumstances of the licensing and the user's needs. But the best practice would be to uninstall AutoCAD Architecture 2009. Then install and activate the Suite products.
Douglas Lauritsen, Autodesk Product Support
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