They are the same in terms of what you can find inside, just different color and name. Storage trunks are blockchain items and require a matching key (e.g. a cobalt storage trunk will require a cobalt storage key) to open them.
How do I open a storage trunk?
To open a storage trunk you need to have both the trunk and the key in your stash. This means they both have to be in your online wallet (game wallet), not in your enjin wallet. If one of them or both are in your enjin wallet, you need to transfer them in-game first (see how to transfer items from wallet to game).
When both are in your game wallet, simply go to your stash, click on the storage trunk and you’ll see a button to open it on the right.