Thanks Quarneo, your upload seems to confirm the other information.
So, to summarize the findings for @Richard:
Only VAT and customs charges are the same for all carriers.
And only DHL standard shipping (not express shipping) seems to give the recipient the choice to either
- claim the package at the customs office (providing documents and payments to the office), or
- request an expensive “customs handling service” (providing the same documents, customs payments, and additional charges to the carrier, instead of directly to the customs office)
Others, including DHL express, UPS and more, seem to always do that customs service thing and charge varying rates, by default. At least if the recipient doesn’t happen to have some special arrangements in place.