Hi,

You can connect two odoo database using the xmlrpc ,

import xmlrpclib
url = 'http://0.0.0.0:8012'
db = 'db_name'
username = 'admin'
password = 'admin'

common = xmlrpclib.ServerProxy('{}/xmlrpc/2/common'.format(url))
uid = common.authenticate(db, username, password, {})
models = xmlrpclib.ServerProxy('{}/xmlrpc/2/object'.format(url))

Also see this video, showing how the data is transferred between two database using xmlrpc :-  Transfer Data Between Databases Using XMLRPC In Odoo : Database Migration

Odoo Doc : https://www.odoo.com/documentation/13.0/webservices/odoo.html

Thanks