Yes, MOTUC Grayskull is a larger and more refined version of the original prototype, just like we have been told repeatedly from the beginning. It's turning out almost exactly as it should in that regard.
Now, the Funimation Grayskull has a wonderfully imposing front façade, but the other four sides look like piles of rubble overgrown with petrified vines. If we were getting just a backdrop for a diorama, then I'd be all for having the front façade of the Filmation Grayskull made, but since we're getting a full on playset, then sticking with the original toy design is best in my opinion.