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0e1f616
(Get the code!)
It's only bad news in that the contents of the sector that's been overwritten are almost completely different from what you gave me before. The only similarity I can see is that there's the following sequence of characters in your first dump:
77DNN88M71000
... and the following sequence in your second dump:
XW0000000017M
The latter is exactly the reverse of the former. Did you receive any Dell updates in the intervening time?
Could you repeat the procedure (say) three more times - reinstall GRUB, record image with dd, reboot to Windows, do whatever you need to do to break things, record image with dd, and repeat? I'd like to try to get an idea of which features of the overwritten sector are stable and can be detected.