Cyanamide mesomeric contributors

Which form of the cyanamide ion is more stable?


As per the resonance rules, I find both of them equally stable as number of bonds is the same, more electronegative atom has negative charge and so on. Is my conclusion right?


[![Cyanamide mesomeric contributors](https://i.stack.imgur.com/5F94km.jpg)](https://i.stack.imgur.com/5F94km.jpg)


