No, 6510 depicts one of the "Funklenk" or radio controlled panzers. These had different turret stowage bins which housed the radio equipment for controlling the Borgward demo charge laying vehicle.
I do not know if the kit contains the standard turret bin.

Cyber Hobby 6587 a Pz III L Trop is actually closer to a late J as it has turret view ports like the J variant.

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No, 6510 depicts one of the "Funklenk" or radio controlled panzers. These had different turret stowage bins which housed the radio equipment for controlling the Borgward demo charge laying vehicle.
I do not know if the kit contains the standard turret bin.

Cyber Hobby 6587 a Pz III L Trop is actually closer to a late J as it has turret view ports like the J variant.

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I have Dragon's kit 9054 "Pz.Kpfw. III Ausf. J Control tank & Borgward IV Ausf. B". It has the standard turret bin (along with the radio control bin). I too was thinking of making a Stalingrad IIIJ with markings from the 24th Panzer Division. One 'grey' area I noticed with my kit and I have not yet dug too deep into, is that with this kit there is a storage bin that seems unique to the purpose of this tank that is on the starboard fender which would not be there for a standard Stalingrad IIIJ.
Maybe this kit could fill your need. At the time for me this was the most easily found kit of a IIIJ (ebay) then the 6394 kit though a few months back it did show up at Sprue Bro with a hefty price that went with it.

Cheers