The high percentage of B2B cruisers suggests the early booking date was successful in enabling people to book the same cabin for both cruises.
Here's What I have to Date... a snippet from my spreadsheet. I will make a link to the complete spreadsheet on a future date.
23 Staterooms ~ 21 B2B ~ 45 Cruisers
It would have been difficult to book the same cabin for both cruises if lots of cabins were getting booked for single cruises. We encountered that on Royal Caribbean. Fortunately we were able to get the same cabin (B2B2B), but others couldn't and had to pack and move to another cabin.
Woody