Eswar,
First try to get an update to UDS to 4.0, If you search the SAP Support Portal, Software Downloads for XMII UDS 4.0 and locate the SP2 Patch 06 exe and download it, use this. Save your 2.5 configuration and export your aliases before upgrading as you may need to uninstall UDS 2.5 in order to install 4.0.
Make sure that you can see that same OPC Topic names defined in RSLinx, in OPC Explorer, and from UDS. Creating the Alias for the tags you want is the correct way to do this with UDS. When PCo 2.3 is released, I believe that you can export your alias lists from UDS and import them into the Aliases in PCo 2.3. You can also set up PCo Agent Instance with the same port as UDS, and MII will work with the same Data Server configuration you are using with UDS.
Regards, Steve