Mobile Legends or MLBB is a MOBA game owned by Moontoon Studios which is owned by Chinese company Byte Dance while HoK is owned by the most popular gaming giant Tencent.
However, the main difference is that MLBB is inspired by characters and myths around the world, creating diversity, while HoK is completely based on Chinese legends. This is the case with HoK because it has a large player base in China before its global launch.
So the skills of the heroes are not exactly the same, so I only compare the heroes that have about 50% similarity.