Well,

first, let me give You a quotation:

Description: Kernel-headers includes the C header files for the Linux kernel. The header files define structures and constants that are needed for building most standard programs. The header files are also needed for rebuilding the kernel. (from rpm description)
Thus, i don't think the kernel-headers belong to the things that Mr.Knopper might have changed. It just would'nt be nescessary. Maybe he added some Kernel Modules or something, but the headers still are the same.

For exact answers, ask Mr.Knopper.