When I filed my N400 (January of this year) my I-751 was still pending, so I uploaded documents from the moment I submitted my 751 until the moment I filled my N400. For example, bank statements, health insurance policies, etc. I did not repeat any documents except for the marriage certificate, and our title property. The title property had already been submitted with the 751, but I just wanted them to understand that we own our house, so there was no joint lease.
My 751 was approved about 5 weeks prior to my N400 interview, so for my interview I just brought N400 updated documents. The officer did not request to see anything, and it felt more like an informal conversation than an interview. I still encourage you to bring updated documents because it is better to have them and not need them, than to need them and not have them.
Off- note: My 751 was approved in the midst of an international trip. So if your 751 is pending, go ahead, take that trip, it might knock it lose hahahaa.