I did email TLeufkens and he did reply to anyone that is interested:
"It would not be necessary to use the same wattage, but the THICKNESS must be
damn close if not perfect. Not sure if you can find the same thickness in
different wattage- they all vary a bit. However you can use the same TEC and
run it at a lower voltage if you are having a power issue running two of the
156 watt tecs"
Jim
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