BB, my recollection is the Witch was the witch from Show White, not Trick or Treat. But I haven't read this issue in awhile. I have ordered the reprint from Amazon for the holiday season. I will post my copy momentarily as this book has been on my mind with the holiday season.
Anyway you slice it one of the more memorable duck tales.
I just read it again and you are right, duh, of course FC 203 predates Donald Duck 26. The story mentions Snow White as well. I guess the witches reminded me of each other, perhaps the nose or the wart....