Are Polkadot and Cosmos the same?

I'm trying to understand the differences between Polkadot and Cosmos, but they seem quite similar in some aspects. Are they essentially the same, or do they have significant distinctions? If they're not the same, could you please elaborate on their main differences? For instance, how do their interoperability solutions differ? Also, how do they approach scalability and security? I'm really interested in understanding these two projects and how they fit into the broader cryptocurrency and finance landscape. Could you help me clarify these points?