If you happen to notice that the revenue you see on Amazon Seller Central is different than the Elite Seller revenue at an account, product, or order level, but the order/units count match, the discrepancy is probably caused by the taxes.
If you add up Elite Seller Revenue plus the taxes collected on Amazon, it will match the revenue you see on Seller Central.
On the Elite Seller side, we will never add up Revenue plus taxes, but for some orders, Amazon shows the taxes as part of the revenue.
EU taxes (VAT) aren't considered in the 'Total Sales Widget'. In view of EU VAT are calculated differently these can be seen and displayed in the P&L widget.