As it happens, YouTube user DragonFox05 noticed the similarities between Untitled and star hopper way back when it was first released, a comment which you can see here. That being said, I’d mostly forgotten about this and in fact have never listened to the two side-by-side to make a proper comparison

According to sogreatandpowerful.com, Untitled was posted on 17 December, 2012, and space pony was released at the start of 2013 over the course of 3 January to 24 February. These dates certainly line up, and the adaptation of the elements in Untitled is unmistakeable. I feel it is more likely that he was looking for a way to end space pony, and reworked the tune from part of Untitled to fit, than that Untitled slowly evolved into the star hopper portion of space pony or was in some other way an early draft, but who can say