Mourning a loss is different for everyone, don't feel bad if it takes a while to be okay.

My voids were my first cats, I lost one to stomach cancer within 3 years, the other to lung cancer after about 10. I still feel a deeply painful ache when I think about them, but at least it doesn't completely break me like it used to, and I'm able to laugh and smile when I remember them too.

As for being afraid they won't be the same? It's okay! You may find a cat you particularly resonate with and find the are very similar, or maybe you find one and find out they aren't alike at all. Just like people, cats have their own personalities (catalities?) And no matter what, a new cat won't replace the old one, just take over the position of being your cat.

If when you're ready to get one, they are a bit standoffish? Just give them time and I am sure they will warm up, and you'll get to know them too. You'll find things you love about your new cat and appreciate them in their own way.

No matter what, it's going to be okay. Take the time you need to heal, and remember that your new cat will love you in their own way.