That's the immutable kernelcache shipped by the machine, and isn't only the kernel but also includes the kexts. You can then rebuild your own kernel cache from

That's the immutable kernelcache shipped by the machine, and isn't only the kernel but also includes the kexts. You can then rebuild your own kernel cache from /System/Library/Extensions and /System/Library/Kernels. (eventually with a recompiled kernel)