Does both 'bookcorpus' and 'wikipedia' belong to the same datasets which Google used for pretraining BERT?
No they are other similar copies but they are not provided by the official Bert models authors.
Does both 'bookcorpus' and 'wikipedia' belong to the same datasets which Google used for pretraining BERT? 
  
 No they are other similar copies but they are not provided by the official Bert models authors.