That's possible according to the page:
> AWS Database Migration Service can migrate on-premises databases to Amazon RDS or Amazon EC2, databases running on EC2 to RDS, or vice versa, as well as migrate an RDS database to another RDS database.
> AWS Database Migration Service can migrate on-premises databases to Amazon RDS or Amazon EC2, databases running on EC2 to RDS, or vice versa, as well as migrate an RDS database to another RDS database.