https://www.wrc.com/en/wrc-2/news/20...4--51-51-.html

In a nutshell, WRC 2 is for manufacturer-backed teams and FIA-sanctioned independent teams.

To qualify, you need a manufacturer name in the title of the team (Škoda Motorsport, for example) or you must have significant experience and ability as well as the necessary finances to tackle a full season for the governing body to sign you off for WRC 2.

For WRC 2 crews, a full season means seven of the eight European rounds and one of two designated rallies outside Europe. Titles will be awarded for drivers, co-drivers and teams.

The aim of the WRC 2 changes is to ensure the leading crews meet regularly through the season. Too often in the past, by accident or design, the second tier’s finest talents have avoided each other and scooped big points, even when restarting after a retirement.
Seems already better than WRC 2 Pro

WRC 3 is designed for privateers, with only a drivers’ title on offer and far less stringent regulations about where and when you have to compete.