The X and Z report offers the same information. However, the Z report will finalise the current batch (this cannot be undone).
A batch is a collection of transactions for the period of time between Z reports, usually but not always, one batch will be one trading day.
The Receipt Journal can be found from Back Office or POS and shows a grid screen of all batches and gives an open search so you can filter for a specific transaction by Name, Transaction ID, Date or Order Total - See screen shot below.
Click here for a more detailed look at the information on an X / Z report.