What they check are

The original source you are using for the register at the time you are registered + your ID origin being used for the verification. Based from my own perspective they will match the source like IP + ID.

It's the same or not, and then once you have a new section or maybe activity from not the original source you are using at the first time you are using. It's gonna to give the flag or warning to you (especially to your account).

Every service doing these, even an exchange will can lock your account for security purpose. If you have different section, but if you using "VPN" for avoided your country restricted the problem are on you because you are should be restricted and broke T&C.