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Won't cause damage other than to your wallet, as you said. Highly unlikely you will notice any change in performance. In theory, an engine optimized for 93 will develop slightly less power on 94. This difference may not even be measurable with sophisticated equipment because 93 and 94 are so close.
If curiosity is killing you the best way to try it is to finish the tank of 93 and fill up on 94.
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