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By the way, before trying `urn`s I tried using the same name, and using `[{name: oldname, parent: undefined}]` as an `aliases` argument, and those didn't work either: all attempts always result in delete and recreation of resources.

What is the full urn of the existing resource?  What is the desired urn after the migration?

Also - are you using recent versions of both the CLI and the AWS package?

Thank you for getting back to me, Luke. I found the problem: I have the latest version of Pulumi, but the node package was not up to date. It is working now.