Is the marriage based N-400 basically an I-751 with extra steps?

[eckoin 211]

Tried to do some reading on this, and it seems like the marriage-based N-400 application under the 3-year rule is sort of like an I-751, except you need some more documents. Am I misreading? 

 

We need to submit the same bank statements, except a whole extra year of them; the same bills, except more of them and more current; the same joint property, except more recent statements, and so on? 

 

Or is it more of a, "here are my three most recent joint transcripts, property deed, car titles, insurance, latest joint account statement" and has nothing to do with the since-date-of-marriage concept? 

 

Side note - since it can be filed online, is there a document size limit? And do I really have to physically print all bank statements, if that's needed, and bring them to the interview for the extreme off chance that's something the officer wants to see?