I can't say as I don't have any experience with the 8000.
I do know that C5500 / C6500 Toner and C6000 / C7000 Toner are interchangeable. NOT the bottles themselves....you have to physically open the end of the bottle and transfer the toner into the appropriate bottle.
To open the bottle simply take a small flat blade screwdriver and pry the cap open, there are two "tabs" that once you release them it comes right off.
I am going to have a chance to check out 1070 toner, I'll report back what I find out.
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