SNS Fan out to multiple SQS - is there a identifier for same message in the SQS

I would recommend you to add message attributes in the SNS message that you are posting for an unique identifier. Also please turn on enable raw message delivery to true for that SNS topic. If it's false(default) the attributes will not be sent to SQS.

Hello.

The message sent from SNS to SQS is as follows.
I think "MessageId" will have the same value even in SQS in different regions.
https://docs.aws.amazon.com/sns/latest/dg/sns-sqs-as-subscriber.html

{
   "Type" : "Notification",
   "MessageId" : "63a3f6b6-d533-4a47-aef9-fcf5cf758c76",
   "TopicArn" : "arn:aws:sns:us-west-2:123456789012:MyTopic",
   "Subject" : "Testing publish to subscribed queues",
   "Message" : "Hello world!",
   "Timestamp" : "2012-03-29T05:12:16.901Z",
   "SignatureVersion" : "1",
   "Signature" : "EXAMPLEnTrFPa3...",
   "SigningCertURL" : "https://sns.us-west-2.amazonaws.com/SimpleNotificationService-f3ecfb7224c7233fe7bb5f59f96de52f.pem",
   "UnsubscribeURL" : "https://sns.us-west-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-west-2:123456789012:MyTopic:c7fe3a54-ab0e-4ec2-88e0-db410a0f2bee"
}