To My mind (and how we use these terms) is:
Validation: Technical check for eAIP (XML structure to ensure that the document will publish correctly).AIXM (technical vaildation against XSD (Schema) and or Business Rules).
Verification: Checking the credentials and validity of processes and actors in the system at different process/procedure stages. For example ensuring the identity of an originator during Raw Data ingestion. Verification of distances or heights on charts or obstacles. (Essentially cross-checking and due diligence).
Both important for sure.