It's same 4 antennas (and array of mortars), there's simply no place inside i think. They just stick out.
Honestly speaking, given how ugly and "bolted on top" it is, i suspect it's Afghanit-L. No way original system designed for this vehicle will be thrown on top like this.
It looks like the 04B APS rounds are also fixed in the general direction and unable to turn, so they need more of them.
I think it's just the lack of room inside the turret as well, as it wasn't designed with APS in mind in the first place.