[Specific] Made a comparison .gif, messed up. I need the two of these closer together

http://imgur.com/a/xfDzN

I went through a very convoluted process in GIMP to make this and then I realized that I had placed the two of them too far apart. I can't fix it myself without taking an eternity (layers are all merged) and I'd like to know if it's able to be fixed in an easier way. Thank you in advance.