I switch around a lot from using my 6 ft power cord for my iPad and my MacBook pro. Does it matter if the little slide in nubs for the power block get mixed up or are they exactly the same?
If it is the brick then they're not the same. There is writing, or should be, on the brick. Best to check that out and see if the voltage is the same. I think the iPad is 10v whereas a MBP is nearing 18v. I could be wrong on both counts.
Edit: ok so it's just duck head thingy itself. Then the above poster is likely correct.