Copy and Paste Tool

I run into this quite frequently when doing textures. You sometimes have to have a symmetrical look to a 3D object. I was wondering if there might be a way to copy a texture from one part of the model and paste it to a different place move it around and then rather blur or erase the edges so that it bends with the opposing side.

It's so much easier to work with it in 3D than In 2D because you can see where your unmatched areas on a texture are located. I know you can use the clone tool, but for a larger area I think this might be a better option. I use the clone tool for all of my seams and it makes it so much easier to get a seamless texture.