Hi Sabina,
You can run the Transaction Detail by Account report and group this by transaction type. If you are looking to compare VAT periods you could look at using the VAT detail report and then customising the data which you wish to see for each year/period. You won't be able to directly compare within QuickBooks Online however you do have function to export and compare in Excel.
I've tried seeing if we have any reports which could assist with the reporting of changes made to transactions in a certain period but we don't have report which does this, you could try the Audit Log available with in the cog wheel of the QuickBooks Online account and filtering this to the user and period of time and looking for edits but this could be very time consuming depending on the amount of changes/users. If you are looking for changes to transactions which have already been filed these will already populate within VAT exceptions report.
Please let me know if this helps or if you need further support.
Thanks,
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