If I have an account at nitrogensports am I allowed to bet on nitrobetting.eu?
You should read the article thoroughly,provided by @Haunebu above and here is the link for that one
https://bitedge.com/blog/everything-you-need-to-know-about-nitro-betting-nitrogen-sports-new-site/It's state that the both the sites will be operating side by side and Nitrogen have just started a new site where you can have you different account created maybe for only US players only.They have also merited this thread which shows it's their subsidiary casino.But always have a proper look before depositing any funds over there.