LG Phone switch

Hi Customer Support.

I currently have an LG X Charge from my previous plan with Xfinity, and I'd like the switch to another possible LG phone unlisted in the store. The BYOD only allows Galaxy, Pixel, and Apple phones. Two phones I was considering were the LG V40 or the LG G8 (listed at a cheaper price elsewhere). I can buy both of these unlocked, just wondering if they're compatible with Xfinity Mobile. Xfinity shows that the current band I'm using is also supported by both phones so...can I buy one of these LG phones and just pop the SIM card from the X Charge into the new one?

Thanks in advance 🙂