Consider the following two similar but different scenarios:
When Brian was on the way to work, he noticed someone crying on the sidewalk. Because during his childhood he saw his parents help in situations like this, he went over and helped that crying person.
VS
When Brian was on the way to work, he noticed someone crying on the sidewalk. Because other people are rushing over to help, he copied the others and went over to help as well.
Would one be modelling and the other be mimicry? Or are they interchangable?