Hi Jen,
With some of my Arabicums and Thai Soco seedlings the leaves are a duller green (almost a grey/green). Obesum leaves are all fairly similar color and appearance, other than leaf shape.
When you say fuzzy. Do you mean somewhat hairy feeling or a fuzzy color?
Some of the Adeniums do have a hairy (fine brassily leaf surface).
Rick

Rick, the undersides of the newer leaves on a few of them are fuzzy-feeling. The color is, as you say, lighter grayish green on all of them. You're right that the obesums are pretty consistent in color, though the leaf shapes vary widely.