Yep. The black one is the big screen, the Green and Pink ones are the smaller screens. Not sure why except maybe someone at Garmin thought the ladies would go for the colors and the men wouldn’t, therefor the the colored ones are smaller. However, they aren’t marketed that way as far as I’ve seen.
Side by side there is actually a very noticable difference in the display, but functionally they are identical.
They added an orange strap option for the men’s. The strap on the men’s isn’t overly long, and the women’s is shorter (see: http://sites.garmin.com/forerunner10/ for a side-by-side). Not sure the smaller ones would fit many men. I’ve got smallish wrists, and the men’s only has a few holes left in the strap.