Copy<config> <global> <blocks> <catalog> <rewrite> <product>Namespace_Module_Block_Catalog_Product</product> </rewrite> </catalog> </blocks> </global> </config>
<config> <global> <blocks> <catalog> <rewrite> <product>Namespace_Module_Block_Catalog_Product</product> </rewrite> </catalog> </blocks> </global> </config>