I think people might feel pressure to be 100% original in all their ideas, but it's nearly impossible to make completely original design choises - so many things have already been created! And all artists follow the same art fundamentals, so similar thinking is bound to happen.
Furthermore, sometimes there's value to a character resembling an existing character, mostly if they have similar roles. I'm not saying to copy a design 100%, but if you're creating, say, a gritty samurai story, fans that have consumed that type of content already come in with certain expectations, and then you want to meet those expectations. They aren't going to vibe with the main character being a clown in this scenario, if that makes sense.
For your character, I can tell where they got the idea! They both seem to have a happy and cute vibe to them, and the animal traits and red hat are similarities, but yours is unique enough that I wouldn't ever get them mized up or think that you deliberately stole the design xD hats and animal traits are just cool things to give a character!