AWS Data Migration Service (DMS) source engine PostgreSQL vs Amazon Aurora PostgreSQL

We are migrating data from a couple of Aurora instances to our own single Aurora instance. All of them run Postgres. I realized that some of our tasks are configured to use PostgreSQL while others are configured to use Amazon Aurora PostgreSQL. Now we have not had any visible problems using either of them (with source being an Aurora instance). But I am curious on whether this can create any future problems. Does anyone have an answer on what the differences are, since I couldn't find any documentation on this.