General practice, not a claim about any one account.
DifferenceBrowser events, consent and blockers
Pixels and event tags run in the visitor's browser. Consent choices, ad blockers and page changes can stop some events. The platform then shows fewer purchases than the store. This is normal, but it should be written down.
DifferencePlatform view and click windows
Platforms credit a sale to a view or click inside a window they set. The store may credit the same sale to another source, or to none. Different windows and rules give different totals for the same days.
DifferenceTime zones and converted currency
The advertiser account, the store and the reporting tool can each use a different time zone. Daily cut-offs then fall on different hours. Converted currency values are rounded at different points, so small gaps are expected.