1) Usually interviewers don't know exactly which cases you have solved in previous interviews. Hence, it is irrelevant for the kind of questions you will receive in their case. One Exception: a prior interviewer might have left a specific note such as "please double-check the candidate's ability to identify and point out second level implications of his analysis". Then the interviewer will double down on this area.
2) The underlying objective informs the CRITERION which you outline as the basis of your structure. So it is ALWAYS the first option you outlined: We have to check whether we can reach our objective (expanding the customer base to level X) by entering market Y. It is NEVER: "we have to look at customers, the company, the product, and competition". This is not a structure - just a random list of buckets without any logic or rationale! These areas should just be a byproduct of the LOGIC that you outline to answer the question. This kind of non-structure ("I want to look into 4 areas") is simply not good enough to be successful at any MBB nowadays.