As the code suggests, the DIA050S is almost the same as the DIA050, in fact the eye will not see the difference
However, the DIA050S is really very different from the DIA050 because the S variant is tear resistant. This makes the label suitable for many applications where tear resistance is important but a plastic label is too expensive. The tear resistance together with the strong adhesive provides a unique combination of strong adhesion which can still be removed reasonably well. This allows this material to adhere well to metal surfaces, even if they are not 100% grease free, and to be removed later without tearing the paper. There are many applications where the DIA050S has unique added value and deployability.