Merging IAS 2003 config with NPS 2008

Hi,

I have Radius services running for my Network devices using IAS in a Win 2k3 server and for a separate set  of devices using NPS on Win 2k8.

I wish to export the config from IAS and merge it with the NPS config. When I am exporting it using "IasMigReader.exe" utility and then importing using the NetSh command, it replaces the existing config in the NPS and doesnt overide it.

Is there a way to keep the current NPS config and just append the exported config from the IAS.

Thanks,