I don't think so. At one point my husband and I were thinking of mixing our ashes together, but when he died I ended up not getting any of his ashes.
I think if you and your kitty were close, it's a beautiful way to stay together throughout eternity. I think people can be just as close to animals, or in some cases closer, then they can to other people. I've had a few pets in my life that I was very close to and I was very heartbroken when they all passed away.