What is the difference of Intercom with /EU?

Dreamliner

Young grasshopper
May 31, 2019
82
10
Moscow
I have an order with DS-KD8003-IME1/EU and DS-KH6320-WTE1/EU.
Is anybody knows the difference with models without /EU, i.e. DS-KD8003-IME1 and DS-KH6320-WTE1?
 
Most likely comes with firmware that have localization on for most EU countries. I had both, didn't see any difference whatsoever.
Thanks. I also have installed both versions and do not see any difference. My supplier from China telling that they use same hardware. May be just pre-installed firmware which could be anyway replaced after first update.
I want to just to be sure that /EU version is 100% compatible with English not-EU versions.