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A judgment creditor can agree to accept any amount they choose as satisfaction of a debt, even after they secure a judgment.
Since they have obtained the right by securing a judgment to then go back to the court and obtain a specific, addtional order for required payment of the judgment debt, such as taking of assets or garnishment of pay, they will likely be less amenable to a settlement for less after they have a court judgment in their pocket, but it is up to them.
If you wish to attempt negotiation of a settlment for less, then yes, you can contact the judgment creditor and make an offer.