Hi,

Seems you need to run multiple odoo instance with different ports in the same machine, for this you can create two configuration files and two separate service files and assign the port in the configuration as http_port.

See this:

1. How To Run Multiple Odoo Instances in Different Ports
   

2. Configuring Multiple Odoo Instance - Odoo Log Files
   

if you need to see different databases in the different ports, you can create seperate database user and set it in the configuration file or you can set the db filter or db_name in the conf file.

See: Filter Particular Database In Odoo

Thanks