The older one will have had more tunings or should have had
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Therefore I would be very wary about buying any piano that I had not played - even if you like one example of the model there is no guarantee you'd like a different example.
Either way, it's best to make a visit to test the piano in person. Take a technician with you and always ask the dealer where the piano was made and then verify this online before you visit.
Feel free to post the make/model/serial number here so that we might help you with that.
All the best
Years ago after stocking the Kemble winsdor in antique cherry for ages and selling loads Kemble dropped the cherry and switched to mocha oak. It took me 14 months to flog the first and only mocha oak and I lost loads of people who would have purchased it in cherry. It wasnt a bad piano in the oak just not a seller round here.
Members of the PTA & I.M.I.T., MIA and Trading Standards Approved. C&G qualified and N&S Diploma. PTD(Precision Touch Design) Technician.