Huh. I suppose you can. The pricing looks a little opaque though, and the fact that it took 3 hours after I wrote my comment for yours to show up kind of implies it's a bit of an obscure service.

I will also mention that the AWS team we were working with on this didn't mention DMS, and, when directly asked, literally told me there was no easy way to do an Aurora -> RDS migration.

Which is weird. This has been around for a few years, and, at least I thought, was a fairly popular service.

Previously it wasn't great, but since they started using Logical Replication for Postgres, it's gotten far better than it was in the past.