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it's a little confusing on the AWS side, but an ECS cluster doesn't actually specify a VPC. You specify the network parameters/arguments on the ecs.Service that runs in the cluster.

In ECS, cluster is a just a very loose grouping of tasks and services. Take a look here:
<https://docs.aws.amazon.com/AmazonECS/latest/userguide/service-configure-network.html>