If you attempt it first check what the wattage output of each power brick provides in DC voltage, and also how many amps.
If they are different then I would not chance it.
But as I said that is one of the main reasons why each of the power bricks are keyed on the end you plug into the xbox 360.
If you look at both the ends from each of the power bricks that fit into the xbox 360 you will see a plastic key.
If they are in the same place, and the voltage output and amp output are the same on the sticker on them then yes.
If not no dice.