I'm usually pretty good at answering my own questions with my own research, but in this case, I have low confidence in my research. Hoping for a first-hand eye-witness or a K2 rep from circa 2012-2014.
I found a decent deal to buy a used 1st-year 2013 K2 Pettitor like this one: https://www.evo.com/outlet/skis/k2-pettitor-2013 . HOWEVER, if the tip design changed after that first year, then I want to reject the 2013 model and look for a later-year model of that same product line (120mm-waist Pettitor/Shreditor 120 from 2014-2017).
So, did the tip design change after that 1st year? My research yields that K2 reps changed the emphasis of their wording starting with the 2014 K2 Shreditor 120 (like at https://www.evo.com/outlet/skis/k2-shreditor-120-2014 ), when they started emphasizing words about the "more tapered tip" and "lower profile tip".
But are those words just their new way to sell the exact same tip design as the year before? Or did the tip design really change after the 1st year?
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