General practice, not a claim about any one account.
DifferenceConversion actions that count differently
One conversion action can count every sale, another can count only some, and a third can be imported from another source. A total in the account can be right for its own rule and still differ from the store total.
DifferenceLate conversions and recent days
Recent days often change after the first report. Conversions can arrive late, and refunds and cancellations come later still. Comparing the last few days with the store will show a gap that is not a real problem. Compare closed periods only.
DifferenceCurrency and shared budgets
Cost is shown in the account currency, and store revenue may be in another currency. Shared budgets and campaigns that span more than one account split numbers in ways that are hard to match. Confirm the currency on both sides first.