Prior to the Krustyland update you could actually replicate the Lv. 25 and Lv. 30 version of Other Springfield in your town. This was the first time since the Lv. 12 version of Other Springfield that you could do that if you wanted to. The reason you can’t copy some versions of Other Springfield, including the revised Lv. 25 and Lv. 30 are because they are built outside of what is possible in the actual game. The developers don’t play by the same rules players do.
Here is one example of what I mean. Take a look at the base entrance to the Springfield Squidport. In the first screenshot you can see how close to can actually place the tile in the game. In Other Springfield the Squidport Entrance is pushed even further against the shore, with the first boardwalk plank resting on the grass.
You also can’t built parking meters on road tiles, yet Other Springfield would trick you into believing you can.