Here you an see the differences between Kyokushin Gekisai Dai and Gekisai Ichi. I just wondered, in the case of Kyokushin they deleted the Ichi and Ni from the names and changed it to Dai and Sho.
I can safely speculate that the Goju version (which are many with subtle differences) is the "original" and that the Kyokushin versions are adapted ones which were tweaked by Sensei's in the past.
But as the Nike commercial says "Just Do it". All I have to add is that understand the kata and not just "dance" it. Happy training ! Osu!