POCO is scheduled to launch a Pro variant for its M3 smartphone on May 19, 2021. It is thought to be a highly re-styled version of a pre-existing Xiaomi 5G smartphone. The latest teasers from its brand seem to confirm this, indicating both devices have the same size of screen and battery - even if the "new POCO" has a different look.
https://www.notebookcheck.net/Xiaomi-shares-official-POCO-M3-Pro-renders-and-specs-ahead-of-its-launch.539840.0.html