When you have over 1200 defence a few shots that do 28/36 damage shouldn't kill in 3 to 4 hits in pvp. There really is NO difference between standard pvp and Iron Banner
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Except there is. I've had plenty of instances of there being massive differences. The most obvious example is that a Level 29 Hunter tanked my level 23 Titan's Fist of Havoc when it's normally an instant kill. I've had high level players take a direct hit from a Fusion Rifle or Shotgun at close range and survive, when in the normal Crucible it would've been instant death.