Unfortunately, no. Plesk has a fixed system whereby each domain has it's own dedicated web space and limits. There is no way to get it to point a domain at the same location and serve the same files.
The only way around this is to not set the domain up as a Physical Host, but instead to use the Frame or Standard Forwarding options to redirect the request to the other site. For more information on each type, please see our articles on how to create a domain and how to setup a domain on your account.
