Why zerstorer and leopard 40/70 are at the same BR?

Game Discussion Realistic Battle
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1

They are both 6.0 right now.
Does gaijin think that:

  1. panzer 4 chasiss = leapard 1 chassis
  2. 77mm pen APCR = 93mm pen full calibre AP
  3. 60 deg rotation speed = 72 deg rotation speed
  4. 3 crew turret = 4 crew turret with shield
  5. 4s reload = 0.5s reload

The only thing that zerstorer have is 840 ammo (while leopard40/70 is 228), but because it has 4 guns in total, the actual round is 840/4=210, the persistence is almost the same.
Why put them in same BR? I think they should have at least 0.7 BR difference.

2

It has way more fire rate plus 3 more guns to take out planes easily, while rhe leo has only 1 slow 40mm bofors that you can also encounter in rank 2.

3

Zestorer is much better as a spaa, the bofors is nearly useless for aa purposes