Differences between the kernel source in FC2 and the kernel source obtained from kernel.org?

[Park Lee <parklee_sel@xxxxxxxxx>]

Hi,
  Is there any difference between the kernel source in
FC2(version 2.6.5-1.358) and the kernel source
(version 2.6.5)obtained from kernel.org?
  Can I also download a 2.6.5 (or higher)version
kernel source from kernel.org to replace the FC2's
origianl kernel source and compile the new downloaded
kernel source to yield a vmlinuz and run it as FC2's
kernel without any conflict? 
  Thank you.

=====
Best Regards,
Park Lee

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