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For public commercial regions at least (I'm not sure for when accounts are across partitions, for example in GovCloud and China), the billing system tracks only that the destination is CloudFront, not the owner of the CloudFront distribution. Therefore, the S3 account owner will not be charged for data transfer to a distribution in another AWS account.
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Just a clarification: it will be free only provided that both CloudFront distribution and S3 bucket are in the same AWS Region :)