The lock/gem/center-metal-thing bits are off-center on them.
I think the silver bits are too light, they "shine" more intensely than the gold parts, so the chest doesn't really read as "lesser" to me. If I saw the two together, I'd guess the silver chest is the fancier one, perhaps platinum.
These look very flat. They're full of texture, but there aren't shadows. Where is the light coming from?
To help the chest look more interesting, you should change its silhouette. For example, make the metal bits stick out a pixel. That would both break up the silhouette, as well as give you more areas where you can have shadows that show the form of the chest better.