How to change my backup for my new iPhone?

So today, I went in to Apple and exhanged my busted up phone for a new version of it. I booted up the phone and I got two options, a back up for 2/2/17 and 9/28/17so I pressed the 9/28/17 but it updated to the 2/2/17? But I went to iCloud> manage storage> back up and the 9/28 one is there, and is different… How do I access this backup? More of my old photos are on that one obviously.

Lol