Which I94 should I hand in?

Thanks for any input. I have three I94 cards in my hand with same number, one for J2, others for H1B. I am leaving US soon, I wonder which one I should hand in at the port of exit, and when I am back with advance parole, I will be issued a new I94 with a different number, does it affect my GC petition? Thanks a lot for any advice and suggestion.