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I am currently studying how the actual behaviour of different actors varies, even though they may occupy similar positions, and I am not sure whether I should refer to this as behavioural variation or behavioural variance.
I did take a look at previous discussions, but could not understand whether these terms have different meanings or not. I am simply trying to say that behaviour varies (that it is not equal for everyone, even if similar)! Would using the word variation or variance imply that I am looking at different things?
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'Variance' is primarily a word of statistics, of mathematical variation. I agree with MrWordy that 'behavioral variation' is a better choice.
Comments  
I don't exactly understand what you mean by actors occupying similar positions, but it sounds to me as if "variation" is a better word.
Students: We have free audio pronunciation exercises.
 Mister Micawber's reply was promoted to an answer.
Thank you for both your comments