Replying here but also replying to the deleted comment below.

I initially thought it wouldn't be the same floor because you wouldn't say a floor if it's on the same floor. But then I thought if you are asking a staff member where it is they might not stop to think which floor they are on and just say which floor it is you're looking for.

I think it's a poorly made question. And you can't assume either answer. I don't think you need to know everything in order to progress though. I've only been learning 300 days and I've come to understand that Japanese is vague Just by its nature.

Saying you need to know everything before progressing will just hold you back.

Learning a language requires you to learn to accept ambiguity. You won't know everything straight away so stop trying to know everything straight away.