からには・からといって: the difference
からにはN2
Meaning
As long as, Since, Given
Past papers
Tested 4 times in past papers
Example
二十歳になったからには、自分の行動に責任を持たなければならない。
Now that I've turned twenty, I have to take responsibility for my actions.
からといってN2
Meaning
Just because
Past papers
Tested once in past papers
Example
ご機嫌斜めだからといって、八つ当たりしないで。
Please don't burst out in anger, just because you are in a bad mood.
How to tell them apart
「からには」: since it has come to this, follow through; followed by duty, resolve, 'must'. 「約束したからには、守るべきだ」 (Since you promised, you should keep it).
「からといって」: the opposite, 'just because ...'; followed by a partial denial or rebuttal. 「忙しいからといって、約束を破ってはいけない」 (Being busy is no excuse for breaking a promise).
One positive, one negative: the most common contrasting pair in reading and choice questions.