what would happen if you use this on a 2x map any difference
You can definitely use it on a 2x map. I've been using it on a 2x map as I test out new things, and it works fine. You do get a warning that pops up when you first start, saying it may not work as intended, but you can ignore that. The big difference is how much it deforms the ground. It's not a massively different thing though.
So yes, after all that wordiness, you can use this on a 2x and there isn't a massive amount of difference.