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it wont be possible to do this with zero downtime as I'm sure you know, but Pulumi should help with the migration.
you can import the existing infra into a pulumi project, run a `pulumi destroy` and then run `pulumi up` with your new account credentials which should be relatively quick

The existing infra is already managed by a pulumi project.
1. Can I use the pulumi resource aliases to migrate only some resources? 
2. How can I make pulumi to delete the CloudFront distribution in one account and create it in another during the same run of `pulumi up`?