SQL Server Distributed Transactions: xp_sqljdbc_xa_commit vs xp_sqljdbc_xa_end

In SQL Server 2019, can anyone definitively tell me the functional difference between xp_sqljdbc_xa_commit & xp_sqljdbc_xa_end? My guess is that commit is attempting to commit the transaction (thank you Mr. Obvious ;-) ) and end is telling DTC "hey, all done here. Please clean up." But, the code appears to live in SQLJDBC_XA.dll (as extended sp) so I can't view it, and I can't find a good reference to confirm my assumptions. Thanks!