So carbon copy I almost feel cringed how much that Kakashi-copy is so similar in design, role.
But given how this guy is popular, the mangaka must have done a good work to make him interesting despite some prejudice for people like me, thinking there is no way for a copy to be interesting.
You meant Gojo Satoru?
Imo the biggest difference between him and Kakashi is the battle strength. Kakashi was only mid tier when it comes to battle strength, and he frequently struggle to beat his opponents in later fights. In the entire story Kakashi eventually grow stronger as he faces stronger does just like the rest of the cast, which makes him a bit more humble and has a "growth" character arc like the other main characters.
On the other hand, Gojo Satoru is designed to be THE strongest character in the world. And this perk gave him tons of fans. Who doesn't love a strong and confident, if not a little cocky character?
However, his biggest issues is that because he is the strongest, the author has to constantly find ways to get him stay out of battlefield so his strength won't break balance. As a result, his whole character arc in the end pissed off many fans.
Ultimately, I would say Gojo Satori probably stand out more than Kakashi when it comes to power and cocky-ness, THE strongest just gets more attention than someone with mid-tier battle strength and constantly struggle in every fight. But Gojo Satoru's strength makes him sits in a more weird position that pretty much has to end in a bad way, unlike Kakashi who ended up getting main character treatment in the story.
Oh and Gojo Satori had way more meme on the internet than Kakashi from what I've seen, lol.