ST and I did extensive checks on CU's (around 100 of them in fact) half were lead tamed and half were para tamed, there was NO difference in Stats or Resists betwen the 2 groups...NONE. There would have been no way to tell any difference on how they were tamed.
I have also Peaced and disco'd...again NO difference. UO told us there would be penalties a long time ago, but I think they forgot about it before it was ever implamented.