It can't be exactly the same, as long as it doesn't exceed 70%, it doesn't constitute plagiarism. Even if more than 70% of your business activities have not caused him losses, he will not pursue it. If your behavior caused him some losses and he sued you, then you must have lost.

This kind of thing is hard to avoid. The biggest difficulty of modern logo design is similarity. The foundation of logo design is western constructivism, which is nothing more than point, line and surface, and is based on the principle of simplicity, which determines that the similarity probability of logo modeling is relatively high.