Yes, it is possible to use a different version of a third-party app in your Odoo version, but the process varies depending on your Odoo setup:

Odoo SaaS (Cloud): It is not possible to install and use third-party apps on the Odoo SaaS platform. If you want customizations or extra features, you can do it through the technical features or Odoo Studio on the SaaS platform. If you need more development or complex flows, you might need to switch to Odoo.sh or an on-premise server.

Odoo On-Premise or Odoo.sh: If you have Odoo Enterprise installed on your own premise server or hosted in Odoo.sh, you can use third-party apps. For installing third-party modules in Odoo, you need to download the purchased module, then move it to the client’s Odoo instance. Once you have moved the module to the server and placed it in the addons path, you need to restart the Odoo service. After restarting, you can activate the developer mode, update the app list, and install the module.

Please note that the process might vary based on the specific third-party app and your Odoo setup. Always ensure to follow the installation instructions provided by the third-party app developer. If you encounter any issues, consider reaching out to the app developer or the Odoo community for assistance.