The 22LR version is mainly a trainer for the 38 and 357 flavors.
The 22Mag on the other hand has merit as a "granny gun" for those who can't cope with significant recoil. Therefore the idea of it being 3oz heavier than the 38 version makes sense. It's still light enough for daily carry but the recoil should be close to zero even for somebody with arthritis or other issues.
There are now a couple of good 22Mag handgun defense loads - Speer has a Gold Dot flavor and Hornady has something as well.