I think that the roll that you've circled certainly could be the mat that is unrolled behind Terry. My only reservation is that the same sort of material is present in the post-IC image of Monica at Bayon. And if the table only holds a tarp, both mats can't have been won at the RC.
But, whatever the source of the matting at Bayon, it would make sense that the post-RC pictures would be taken at the 'first-place' camp. And, in this case, those images were very tightly-cropped shots produced at Ta Keo.
Too, there are Keith's ballsy talents to add to the mix. So, I do think that Ta Keo won the Reward Challenge.
And I hope that Angkor won the tarp. And, if they did, I just wish that canvas was edible. I don't find watching people utterly spent and unfairly disadvantaged in the Game via starvation ... amusing.