Although changes during a model life can happen with some other brands, conrad johnson models are very consistent along their life - I would expect GAT sn 1 to be exactly the same as the last GAT produced before the GAT 2.
I have had two Premier 14's, one early sample and a late one side by side - the only way to separate them was looking at the serial number.
The GAT2 has a different printed circuit board than the original GAT (series 1) . During the upgrade the old most expensive components are migrated to the new PCB, six new very expensive Teflon capacitors are added, as well as new power supply regulators and a few components. IMHO the upgrade price in the US is a real bargain considering the new parts and work involved in the operation.
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