I can confirm that they are. Just sold my xd for an xdm and all of my mags fit, the plastic extension covers are different but they can be swapped out. They give you two extra with the gun.
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"A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks." -Thomas Jefferson