The key changes involve the ability to create a new app with a subdomain even when there is a matching app by the root domain. The specific changes include:

1. Subdomain App Creation: The ticket addresses the need to create an app with a subdomain like tagmanager.google.com or analytics.google.com even when there is a matching app by the root domain google.com.

2. Testing and Verification: The feature was tested and verified using version 2.1.24, and it was confirmed that sub-domain app creation is functioning as expected.

This change was implemented to enhance the flexibility of app creation in scenarios where subdomains are involved.