Compare the hazard classes common to the harmonized classification and self-classification
Harmonized" classifications vs. "proposed by a REACh dossier

You must use the classifications and labeling elements listed in the harmonized entry in Annex VI of the CLP Regulation, not those from self-classification. Indeed, Article 4.3 of the CLP Regulation states that the substance must be classified in accordance with that Annex and that no classification is to be carried out for the hazard classes or categories covered by Annex VI.

However, self-classification may take precedence over harmonized classification in the case of minimum classification. Indeed, for certain hazard classes, the classification performed according to the criteria set forth in the DSD does not directly correspond to the classification into a hazard class and category under the CLP Regulation. In such cases, the classification provided in Annex VI is considered a minimum classification, that is, the less restrictive hazard class of the two....