The report period and the accounting method can be some of the reasons, david-cockburn-p. 

You can open both reports on a different tab so you don't have to go back to click one report to the other. You'll have to make sure that they have the same Report period. With the Accounting method, Statement of Cash Flows reports as Accrual. You can click the accrual method in your P&L for them to match.

If they still have different figures, you can also drill down to your Statement of Cash Flows so you can see what associated accounts are reported. There might be included accounts that aren't reported in your P&L. 

You can also check out this reference on how to customise your reports to add more display. If you want, you can also save the customisation so you don't have to filter the report every time you need it. 

If you have further questions, please let me know. I'd be around to help!