I've given a lot of golf lessons in my day, and I can unequivocally say that no two swings are alike. So, when I hear students express frustratration about being unable to match my swing exactly, I tell them that each swing is unique.
Not every golfer has the same physical abilities, so your swing is automatically going to be based on what you're able to do physically.
The thing to remember is that the Peak Performance Golf Swing provides you with basic guidelines to follow. But, your vertical swing might be slightly different than another. As long as you're hitting the ball solid and straight, it's okay if you don't look exactly like me. The important thing is that you're improving and utilizing a true, vertical golf swing.
Keep it vertical and find your own comfort zone with the basic parameters of the PPGS!