I agree that Bayonneta 1 can be downloaded on the eShop, but the only retail release of Bayonneta 2 has Bayonetta 1 included. There is only one retail release yet two entries in the database.
Correct me if wrong, but there was only one NA release and it had Bayonetta 1.
I believe you are right. I was unable to find any evidence of a version without Bayonetta 1 existing.
Bayonette 1 can be downloaded separate on the eShop.