Matthew, yes Sir. The 45 and 10mm are the same size. Alien Gear is my favorite for quality and exact fit : http://aliengearholsters.com/holsters/springfield-xdm-525-inch.html

alien gear holsters and they are great if you have any issues http://aliengearholsters.com/holsters/springfield-xdm-4-5-inch-barrel.html

Matthew, the external dimensions are the same as the XDM 45. Anything available for the other caliber in the same barrel length should work great.