So... is Cinderella Boy finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: September 13, 2003
Manga finished: January 01, 1980
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Cinderella Boy follows the adventures of Ranma and Rera, partners in a detective agency located in the vibrant Giraffe City.
Their lives take a bizarre turn following a suspicious incident.
At midnight, Ranma and Rera experience a strange phenomenon: they switch bodies!
The series then explores the chaos and intrigue that ensues with Ranma vanishing and Rera transforming.
They must navigate the challenges of their altered states while continuing to solve mysteries in their unique circumstances.