Gapols

Aloha. We just got our interview notice and schedule for my Green Card. My wife is my sponsor, and my Father in-law is my Co-sponsor.  In the letter one thing we need to bring is the Form I-864. which say, "If required, a completed Form I-864, with all the the required evidence(unless already submitted.)", which we already submitted during our application.
My questions are :
1)My wife have a different Job now and different employer. Its not the same employer that we indicated in the form I-864 that we submitted. Do I need to do a new I-864? 
2) Do I need to bring my wife's new paystub ?or the old one is good. 

3) Do we need to inform the officer about the change of Job?

Thank you so much.