The Sham of the High Rated Current

Coils are used in switching controllers as power coils. Parameters such as inductance, rated, saturated current and R_DC, are determined and declared by the coil manufacturers in the datasheet specifications. In practice, coils of identical construction are compared in order to make a selection for a switching controller. But then the question arises for the developer, why the rated current can differ between coils of the same construction from different manufacturers.