Why is it that my sister and I have different latest kernel versions, even though we both have Linux Mint 22.2 Cinnamon?

My kernel version is ‘6.8.0-87-generic’ and hers is ‘6.14.00-33-generic’. My brother, who uses CachyOS, has kernel version '6.17.1-2-cachyos'. So it makes a little sense that the kernel is different. Even though I always thought that there was just one kernel that all Linux versions use.

But why is there a different kernel for the same distro?