79 Chevy Pickup

Can anyone tell me if the window regulators will interchange from door to door, or do I have to get a drivers side regulator for the drivers, and a passenger side regulator for the passenger side? I have a drivers side regulator, but the passenger side is messed up and I am hoping to use what I have...Let me know if they will interchange...Thanks in advance

My parts book shows a different part number for the left and right side. So I'm guessing that they would not be interchangeable.