Questions about Nexus 6

As the title says, i ned to know since i vänt Find anything anywhere.

Next month ill be buying the Nexus 6 comming from a note 3

Whats the difference in model number? Eg XT1100, XT1103
International and US version of the phone.

Is there any hardware specific modem changes that i should be aware of before buying it?

Does it matters to me? (Living in Sweden)

Are all custom roms compatible with both model numbers?

Thanks in advance. :confused:

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