March Acquisitions.

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What's the difference between Premium and regular Robo-Vision Prime?

There is none.

Hasbro has acknowledged the following existing store exclusives as part of the Premium Line:

Robo-Vision Optimus Prime = Premium Voyager Optimus Prime
Limited Edition Metallic Finish Megatron = Premium Voyager Megatron
Limited Edition Metallic Finish Ratchet = Premium Voyager Ratchet
Deep Space Start Scream = Premium Voyager Starscream

And thus, you will not see any of these figures specifically repackaged under the Premium moniker.