OK - I know this is a forum where you can get help and in a sense there is no such thing as a silly question, but on the assumption that you are yourself an MBB consultant with an FS background, I find this staggering!
Soooo.... MBB consultants that work on FS projects do not know the basics of what an investment bank does, how to split it into business units, what those BU activities are, what the staff structure is, and the day to day activity, and cannot then make a basic comparison of those activities to their own skills.
Elvis on a bike! you could get that from typing Investment Bank into wikipedia! Alternatively you would think you might pick it up on one or more of your assignments?
The next time someone mentions the intellectual brilliance, analytical rigour and general superiority of MBB consultants, I'm going to point them to this thread!