Nicktoons Unite game Question!?

I'm looking to get the old PS2 Nicktoons Unite game for my cousin, but as I was searching I realized there's just the normal plain "Nicktoons Unite" title, and then there's one with that title but "Greatest Hits" above it. Is there a difference between the two? Does the greatest hits... show more I'm looking to get the old PS2 Nicktoons Unite game for my cousin, but as I was searching I realized there's just the normal plain "Nicktoons Unite" title, and then there's one with that title but "Greatest Hits" above it. Is there a difference between the two? Does the greatest hits one have extra content? Google wouldn't give me the answers I needed.
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