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1) The zone equipment is simulated in priority order. This means that each equipment component will add or subtract from the zone load and the next equipment will try to meet the new load. This means that each equipment will meet a different load. The only way I can think of to operate 2 components identically is to use the EMS programming language.

ZoneHVAC:EquipmentList,
  Corner_Class_1_Pod_1 Equipment,  !- Name
  ZoneHVAC:AirDistributionUnit,  !- Zone Equipment 1 Object Type
  Corner_Class_1_Pod_1 Dual Duct Box,  !- Zone Equipment 1 Name
  1,                       !- Zone Equipment 1 Cooling Sequence
  1,                       !- Zone Equipment 1 Heating or No-Load Sequence
  ZoneHVAC:WaterToAirHeatPump,  !- Zone Equipment 2 Object Type
  Corner_Class_1_Pod_1 Heat Pump,  !- Zone Equipment 2 Name
  2,                       !- Zone Equipment 2 Cooling Sequence
  2;                       !- Zone Equipment 2 Heating or No-Load Sequence

2) Using a larger piece of equipment should not introduce significant differences in the results. I admit I have not tested this theory to determine the magnitude of the difference but I assume them to be small. DX cycling equipment would have more losses if there were 2 components, but then again, if there are 2 and they are always running, there would not be cycling losses now would there.