No, it can not. There is not and never has been any torque vectoring system used in WRC cars. What is being changed by switching of differential maps is the locking behavior not the torque split.
If I'm not wrong there used to be some king of adjustable split in Toyota Gr. A cars. But I'm not sure it was about the torque.
"With that car, your brain can actually never keep up"
https://www.youtube.com/watch?v=_4IRMYuE1hI
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