Greater Retrieval Prism let's you recall any object in your posession as a free action, but the normal Retrieval Prism doesn't have that restriction. You designate one object when you affix it to your armor and then can recall it as a free action, the only restrictions being the object is 1 bulk or less, you have a free hand, and the object is on the same plane.
I feel like the base Retrieval Prism was intended to have the 'in your possession' language, but I don't see anything in the errata about it.
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Because the normal Retrieval Prism is really designed to work even when the attuned item aren't with you. The last paragraph also completes this intention that you can call the item no matter the distance but have to be in the same plane:
The retrieval prism can't retrieve an item that's not on your plane, including one that's in an extradimensional space like a bag of holding. If you haven't expended the talisman, you can attune it to a different item by Affixing the Talisman again.
The greater version removes the need of you specify one item to talisman work but add the requirement that the item is with you.