Microsoft's Web Platform Installer lists "Web Deployment Tool 2.1" with a release date of 4/11/2011, and "Web Deployment Tool 2.1 for Hosting Servers" with a release date of 4/8/2011. As far as I can see (by clicking Add, then Install), the contents are the same: the deployment tool itself, SQL Server 2008 R2 Management Objects (Dependency), SQL Server Native Client (Dependency), and SQL Server System CLR Types (Dependency).
Are these actually different, and if so, how? (And if not, why list them both?)