According to Digital Chat Station, the Redmi K40 series will feature an ultra-small punch hole and Samsung's most expensive flat display. Xiaomi will borrow the display directly from the Mi 11 while using the Qualcomm Snapdragon 870 on the Redmi K40 series, also.
https://www.notebookcheck.net/The-Xiaomi-Redmi-K40-series-to-feature-the-world-s-smallest-punch-hole-and-Samsung-s-most-expensive-flat-display-Snapdragon-870-expected-for-February-bound-flagships.516266.0.html