Webtrekk has the metric order value. This specifies the monetary value of the purchase orders created. The value can differ from the value of the metric Purchased Products if the order value takes shipping costs, discounts, etc. into account.
At Google Analytics there is the metric Revenue. The total revenue or total amount of the transaction. This value may include shipping costs, taxes, and other corrections to the total revenue to be included in your revenue calculations. Therefore, it is necessary to observe exactly which values are compared.