My dad has an base model 2012 Pop, and I have a 4x4 with the folding seat. We live in different cities so I haven't had the chance to compare them side by side, but from what I remember from visual memory, the non-table seat is basically exactly the same as the driver's seat but without height adjustment. On the other hand, the point from which the picnic table seat folds at the bottom of the backrest is a good 4-5cm higher that the driver's side seat in my 4x4, which means that the whole seat back and probably hinge and seatback mount are different parts. The height difference also plays an important role in that without it, the seat back couldn't possibly fold flat as the seat back and seat base would be too close to each other and would only fold about 45 degrees before squishing too much of the seat foam to fold any further.
Truth be told, my experiences with the picnic table seat aren't that good and have the following shortcomings:
1. It eats into rear legroom quite a lot and there's nothing to be done about it because the plastic is screwed into the seatback frame and can't be removed easily, and there's no fabric underneath once it is removed.
2. Folding it down is a pain. First you have to move the seat all the way back because the headrest can't be removed and it won't clear the dash in most cases. Then you fold the seat down by faffing about from both the front and rear. Then you have to go back up front and slide the seat forward for any semblance of foot room in the back, but it only goes forward a certain amount because the head rest (again, non-removable) hits the glovebox.
3. When the seat is in table mode, the rear seat is slightly lower than the table. So it's too low to be a useful table, but too high to use as a leg rest from the rear seat (I tried, having your legs up in the air means they go numb pretty quickly).
4. Getting it back upright requires just as much faffing about as folding it.
5. Last but not least, because of the aforementioned difference in hinge height, the passenger seat ends up never being as comfortable as the driver's seat no matter how much I adjust it.