There are some similarities. A key difference is buddhism’s emphasis on meditation and practice as a key part of learning to act skillfully which I don’t think stoicism emphasizes as much.

Stoicism has always felt more “human scale” to me. It talks in terms of human virtues, and how a good life is only found in virtue. Buddhism always felt more focused on the mechanics of the mind and how understanding can be converted into attaining happiness/enlightment.

That being said, I’m not nearly as knowledgeable about stoicism.