The other problem is that those two examples aren’t from the same source material.
The new release planned by Netflix looks and feels very different than their She-Ra reboot, and those two lines were interwoven in the past. Thundercats, which is a Rankin-Bass IP (like the classic racist Christmas specials), would probably better fit with Silverhawks and Tiger Sharks, and the newest incarnations have a world very different from Eternia and Etheria.