It is a new variation, I noticed it a little while back and was able to pick up both variations...
I first noticed the variation when the SCD has him listed as Topocer (mispelled) and Lipset has him listed as Toporcer (correct), and I began looking for him to see if they both existed, which they did. I haven't noticed one being that tougher than the other, but I could be wrong.
-Rhett