You are looking for AWS CloudWatch Cross-account cross-Region dashboards (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_xaxr_dashboard.html). You need to enable the option first in CloudWatch settings, and then you will see the option to choose Account Id/Region in Metrics dashboard.
After adding different metrics, use CloudWatch math to aggregate values, ex: AVG, SUM.
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