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Nope. Go ahead and play. There is no RB on party.

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I believe there is some talk that rakeback will be available on Party Poker.

I don't know the answer to the OP's question, but I think he is asking if playing on his old account will make it impossible for him to get rakeback on a new account in the event rakeback is made possible.
If you get rakeback now at some other site, you can probably ask your affiliate what he thinks. That might work.