Yes. I stole this picture from the first post of the
Share Your Island Map-thread and you can see that there are 4 different shapes just in these islands alone, and I'm pretty sure there are actually a few more.
I clicked through a couple of pages of that thread, and it seems that the one that Sander posted, aka the one in this picture on the bottom left is the biggest option. It might be easiest to just reset for that? But I did only check a couple of pages, to be sure I'd check more. Also I don't know if you are aware, but you can click on a map to see it better and then deny that map to go back to the four maps Timmy and Tommy showed you, so you can look a bit more closely.