iPhone 11 pro purchase from USA website and using it in South Korea.

Hi. I'm a New Zealand citizen living in South Korea. Would like to purchase iPhone 11 pro from USA website and receive it in South Korea.

The local Apple service center says I need to choose the correct model so the network actually works here. Thought purchasing the unlocked phone would do the job.

FYI, I use KT (telecommunication company) in South Korea and have a SIM card already.

When I see the tech specs under "Cellular and Wireless", I see two models (Model A2160* and Model A2161*). I don't see any difference in the specifications.

Q1: There will be more models later within iPhone 11 pro?

Q2: Choosing any carrier other than "AT & T" and "pay one time" would give me the unlocked phone. But,,, don't know what to do next to choose the correct model so the network is usable in South Korea. How do I choose the right model?

Q3: When I order iPhone 11 pro on USA website, how do I purchase protective case (transparent) and the screen film? iPhone 11 pro will be out in Nov in South Korea, I think. There will be no available accessories till then.

If you have any other advice, please let me know.

Thx for reading.