The Color of the front sight is just for color choices..
I don't believe they make any shorter ones but If I remember the 44 mags sight is shorter than the 357/22..It's been awhile..
Also you could get a solid partidge sight & just file it down to your liking..
That's what I would do.. But it then wouldn't have an insert & wouldn't be as quick to the eye..
I don't have any extra sights anymore but I'm sure someone else here could fix you up with one, You also see these from time to time on Ebay & Dan Wesson Arms might be able to help you..
Good Luck Fellow DW owner/shooter..
DW