In the past at different times they reportedly used Perle, Magnum, or a blend of both for bittering, but as the more recent screenshot there indicates, they've gone all Cascade now. But Jim's got a point. Their process may get more/different flavor or bitterness out of the same hops than your process. Rather than just trying to duplicate the recipe, you'll probably do better just going by the taste of your final product. I too find that his blend in my brewery gives a result more similar to SNPA. For some reason. The same principle probably applies to the grain bill. You may need a different amount of crystal, a different color crystal, even some other specialty malts included to get the result you want.