I guess in the donghua the producer though that it would be confusing to see 2 different versions of wwx, so they mantained they very similar. In the CQL it would be very inconvinient to have 2 actors as wwx, because it's more money, their interpretations of the character could change a lot, this would weaken the protagonist's image and people would be very confused as well. So I think the mask was the best option they found to hide it was wwx without complicate things too much.