Mike,
You may want to ensure that data traffic goes from an untagged port to an untagged port on any other Ethernet card . Same applies for tagged ports.You can't mix and match.
Untagged --------> Untagged ; Tagged ------------> Tagged.
E100-T-12-G cards need an XC-10G control card. Apart from that requirement, my assumption is that their functionalities are the same.
Hope this helps. If it does'nt , do provide info on how the Ethernet ports are tagged and whether you have a point-to-point connection or Shared Packet Ring topology.
Praveen.