SSM documents support versioning. AMS Advanced SSM documents can't be modified from the customer’s account and can't be re-shared. They're centrally managed and maintained by AMS Advanced in order to operate the account.
Version numbers are incremented with each document update in a specific AWS Region. As new Regions become available, the same document content in two Regions can have different version numbers; this is typical and doesn't mean their behavior will be different. If you want to compare two AMS Advanced SSM documents, we recommend comparing their hashes with the AWS CLI:
aws ssm describe-document \ --name AWSManagedServices-DOCUMENTNAME\ --output text --query "Document.Hash"
Two SSM documents are identical if their hashes match.
