The warranty ( warranty for defects) is a legal obligation of the dealer, through which the customer is entitled to certain rights. The guarantee (manufacturer's guarantee) is a voluntary additional service provided by the manufacturer. You as a customer can choose what you claim if you are entitled to it.
Notice:
Processing of a complaint by the manufacturer for an item which does not offer an explicitly stated manufacturer's guarantee is to be regarded as a goodwill gesture on the part of the manufacturer.