It depends what culture is mapped to your RB faction. By default it is roman. SO RB uses Roman portraits.
If you want your RB generals to have the Roman rogue portraits then you just use them in the generals' folders instead - but all your other factions drawing off the Roman culture will also get them.
If there is a culture you are not using you could assign the RBs to that and then copy the rogues over.
The files are all in the UI folder of the pak files (or in the BI data\UI (which is not packed) folder for the new cultures).
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