They are identical, so you can swap them and see which one works. Or, because the drivers side is such a PITA to change, you can buy another actuator from rockauto.com ( you've seen the commercials, they ARE low price!) for ~$30 and just change the passenger side, which is real easy to get to. I'd inspect the operation of the passenger side actuator first though to see if it's actually working or not, first with it still mounted, if it doesn't move with changing the temp slider, take it off but leave it plugged in and watch if it moves. You can check if the blend door moves freely when the actuator is off.
Good Luck!