XI runs on Netweaver 2004 and PI runs on Netweaver 2004s.
They are basically the same technically but when SAP launched Netweaver 2004s , to bring all objects of Netweaver 2004s in Synch with the WAS version, XI was renamed to Process Integration (PI 7.0) .
Currently every SP release of XI has a corresponding release for PI and they both support the same functionalities.
Regards
Bhavesh
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