Verizon model for att user

Okay, so to start off I've had an iphone for a couple years now and I'm way outta the loop on android things so please bare with me. I got my dad a moto x2 off ebay, its a verizon model. Looking on here I didn't see a verizon model posted in the phones section. Is there a difference other than software between models? Like could I flash a rom with an at&t radio and not have to worry about the dumb sim card error and have it work on lte? If so could someone just link me such a rom thats pre-rooted, debloated, and close to stock? I would really appreciate it. Also any tips or tricks on this phone would be awesome. (ps I'm not new to the custom rom scene just rusty)

Also did this thing get an official marshmallow update?

Thanks!

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