Using Glacier after Synology NAS migration

Since 2013, I am a happy Glacier user. Backing up my data from a Synology DS413, using the Glacier App. Recently I upgraded my NAS to a DS923+. All data migrated, working fine. The Glacier settings (4 Back-up-Tasks) were not migrated. I am not sure how to proceed, tried to find directions in re:Post and Knowledge Center to no avail.

Most logical to me seems: create 4 new Tasks on the DS923+ using the same credentials (Account number, Access Key and Secret Key), check it creates new vaults or uses the same vaults ? The servername of the DS923+ is different from the name of the DS413, so Glacier may create new vaults ? In that case I could remove the DS413-vaults ?

Hopefully someone can assist me in doing it right. Thanks & best regards, Joost