Until doing this size comparison I had no idea that the Springfield XD 3.0 Compact in either 9mm or .40 S&W is virtually identical in proportions to the Springfield XDM 3.5 Compact in 9mm or .40 S&W. The only noticeable difference is the obvious half inch difference in barrel length. I guess one should never assume, but I sure assumed there was a size difference probably based on the aggressive look of the XDM.
Putting the size comparison and proportions aside, there are quite a few differences between the XD and XDM models. I am personally looking forward to a more compact XDM option being released in either .40 S&W or .45 ACP. You can check out both of these models at their website: springfield-armory.com
The only difference between image 1 and image 2 is the XD is on the top layer in image 1 and the bottom layer in image 2. The minor differences you can see along the borders of the outlines are fractions of a fraction of an inch and more likely small differences between lighting in the original photos than action pistol size.