Side by side?
I think GSW still wins the series.
Yes both at the bottom of the key, symmetric composition.
It is a huge handicap. Much closer corner three, or step less when attacking closeouts, post pin effectiveness goes up, lob opportunities multiplying.
And of course Phoenix is an NBA team, with NBA players.
But even with that, I feel like the warriors would pack the paint, and by the end of the series GSW would master it's zone defense, while still having enough length to contest Phoenixes not so great shooters.
This might actually be a Kerr or Kokoškov moment, even more than in normal circumstances.
Warriors in 6.
Oh and I think that NY would be an easier opponent.