1.The difference between mandarin and Northeast’s Chinese
2.There is nothing big difference between mandarin and Northeast’s Chinese in writing and grammar,but The Northeast’s Chinese speak dialect.
3.It's easy to distinguish mandarin and Northeast’s Chinese through intonation and accent.
4.But there is no big difference between them.The people who speak mandarin can also communicate well with the Northeast Chinese.
以上只是个人意见,仅供参考.其中东北话这个词我不是很确定.或许也可以用这个词Northeastese.国为很多语言都是在地方后边加上ese.如广东话,天津话等.但我不能确定.