Hayward TC-15 vs TC-9

I have a TC-15 cell that appears to be at the end of its useful life (4 1/2 years of year-round use in Florida). The pool holds 12,000 gallons of water.
Can I replace the TC-15 with a TC-9 without reprogramimming the AQR? The AQR seems to be working prefectly.
Is this a wise replacement? Or is the TC-15 better value?
Thanks
Rob
 
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