What the title confirms
The official project title uses Black Myth, and Game Science is the developer. That is enough to discuss the projects as members of the same named series or publishing line.
It is not enough to infer when their stories occur or whether their worlds are narratively identical.
Different cultural centers
Sun Wukong grows from Journey to the West and its enormous afterlife. Zhong Kui grows from demon-queller legend, protective imagery, seasonal display, painting, and popular belief.
A shared series can explore those materials without turning the two figures into rivals, relatives, or direct companions.
Common unsupported claims
No primary material cited here confirms that Zhong Kui is a sequel protagonist, Wukong's judge, a replacement in one continuous campaign, or part of a published crossover plot. Those ideas remain speculation.
Likewise, shared visual tone, interface conventions, or production technology cannot establish narrative continuity by themselves.
What would confirm a connection
A developer story description, named returning character, explicit timeline, official interview, or released narrative scene could support a stronger answer. Until then, the reliable response is short and limited.
This page will be revised if primary material changes the record, with the earlier uncertainty preserved in the update history.