Walnuts have a shell, and they have a kernel. Religions are the same. They have an essence, but then they have a protective coating. This is not the only way to put it. But it's my way. So the kernels are the same. However, the shells are different. ↗
Android is very different from the GNU/Linux operating system because it contains very little of GNU. Indeed, just about the only component in common between Android and GNU/Linux is Linux, the kernel. ↗