Difference between the Series 1(1st Gen) & Series 1(2nd Gen) Digitizer

"Lets use better terms to describe the different watches & parts interoperability:

Original - Unique partsSeries 1 - Same as Series 2 except logic boardSeries 2Series 3 - A few parts the same as Series 2

The Original (Gen 1) and Series 1 (Gen 2) only have the same specs they are different parts wise as such you'll need to get the digitizer meant for your watch (Original or Series 1/2)"