 Vayu and Vayaviya Puranas do share a very large overlap in their structure and contents, possibly because they once were the same, but with continuous revisions over the centuries, the original text became two different texts, and the Vayaviya text came also to be known as the "Brahmanda Purana".The "Vayu Purana", according to the tradition and verses in other Puranas, contains 24,000 verses (shlokas).However, the surviving manuscripts have about 12,000 verses.