I just checked what my eCS provides in matter of NIC information: I am not sure if I can identify your EtherJet PCI card correctly from what you said above, but...:
In my systems "ibmfeeo2.nif" that claims to be used for "IBM 10/100 EtherJet PCI Adapter", there's a parameter called "SLOT" which is used to identify the adapter if there's more than one of them installed. I'll try to translate the german help text here:
(This is the help text that is displayed within MPTS configuration when selecting the adapter and editing its settings...)
"SLOT: This parameter is only required for systems having more than one adapter installed. If there is more than one PCI adapter installed, proceed as follows: 1) Finish the configuration dialog without entering anything in the SLOT field for the adapters installed. 2) reboot the system and note the displayed contents of the slot assignments by the drivers. 3) For each driver, enter one of the parameters (exclusively) that were displayed at bootup."
So this means, that if you have two of them installed, you'll need to launch MPTS.EXE and proceed to the NIC config. Then add TWO of the EtherJet drivers to your configuration. Next, reboot the system and watch what the drivers are displaying as the "slot assigment" for each card. Back in MPTS, edit the driver parameters and add one slot number displayed for each of the drivers exclusively. That should do it.
Greetings from Cologne, Germany