No but close. A SQlite file is a single format. The journal file and the WAL file are different formats used for bookkeeping by the library to attempt to be ACI

No but close. A SQlite file is a single format. The journal file and the WAL file are different formats used for bookkeeping by the library to attempt to be ACID compliant. The library implements some complex logic to ensure this, but reading/writing a SQLite file does not require any of this. You could write your own code tomorrow that reads/writes SQLite files but does not produce, read, or write WAL or Journal files. So long as the resultant SQLite file follows the specification, it can be read by any other piece of software that implements the specification, such as the SQLite library or SQLJet (https://sqljet.com/ https://sqljet.com/).