XPS 13 and XPS 13 Developer Edition differences

I have a few questions about XPS 13, don't really know where else to ask them as distributors in my country haven't been able to answer them:

1. Is there any difference in hardware with XPS 13 and XPS 13 Developer edition?
2. If there is no difference and I remove Win10 from XPS 13 and install Ubuntu, where can I find the drivers that are already preloaded on XPS 13 Developer Edition?
3. XPS 13 Developer Edition is listed as available in North America and Europe - I'm from Croatia, Europe and for a few months now I've been given negative replies from distributors on my availability inquires saying the model is not available and they don't know when it will be available. Is there a number I can call for Dell EU to get more information on this?

Thanks!