We can describe two things we do in one time with a participle construction like the following sentence:
We had a chat drinking a cup of coffee.
However, we may also describe the same situation with "over" as follows:
We had a chat over a cup of coffee.
Is there any difference between these sentences?
I know "over a cup of coffee" is a common expression which means "during [while drinking] a cup of coffee", but "drinking" and "over" are probably different in word class. I would like to understand why these sentences can describe the same situation (or not the same).
Thanks in advance.