Non at&t rom on at&t device.

Dear ,
I have an unlocked LG G3 D850. It had the at&t and it was causing problems with day to day use. I put twrp, cloudyg3, and rooted. Of course 5.0 is not good, so I want to either revert back to 4.4 or 6.0, but without at&t bloatware.

My question is, can I flash the D855 on the D850? This is not a device specific question. Does at&t change the hardware? Can I flash a non at&t on an at&t device? I would flash the new 6.0 at&t but do not want the bloatware. I would also like to keep it like stock lg, without the CM launcher or that stuff.
Again, this is a general question and not device specific.

Thank you modders!
(I researched and saw no answer to my question anywhere)

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