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I am not an electrician, but I would think that sharing a ground would be ok. In a normal, modern electrical box, all of the circuits use the same ground bar.
I too have an old house that I just acquired. I have noticed that many of my electrical receptacles have a separate ground wire that is attached to a plumbing pipe. This is where the original wiring is knob and tube with no separate ground. I will slowly replace a lot of the wiring with romex as I have access to the main floor electrical from the basement and so this project won't be too difficult. The upstairs will be another issue.
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