Probably will be tough. The warranty is to the original purchaser of the hubs. They will often ask for the receipt. You may get lucky and find a dealer that will swap them out without asking to many questions.
"Sometimes one pays most for the things one gets for nothing. "
I just warrantied a Warn Hub today, but I had a receipt from the set of spares I bought. You will have trouble warrantying a set from a couple of years ago, with a new receipt, though. They recently(when????) improved the D44, design with a taller locking assembly, that has a different and very noticeable spring and actuating assembly.
I powdered the inner locking splines, a few weeks ago. The local shop I bought them from warrantied them within a day, after contacting Warn.
(sensibly altered for occasional off road use)
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