Clone my wife's OPO onto my OPO?

Hi - My wife's OPO has a GPS that's starting to misbehave. I have a OPO that I'm not using very much anymore. My wife's OPO is on Lollipop, and my OPO is on Marshmallow.

I wanted to do a full TWRP backup of her phone, and then restore it onto my phone. Is this possible? Also, what special steps should I / shouldn't I do?

Thanks,

¿GJ?

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