I have two TikZ figures that are identically sized images saved as separate tex files. The images have vertical symmetry. I would like to plot one image of the same size, with the left half from the first image and the right half from the second image to compare them.
The files are long and automatically generated and hence I don't want to modify the source TikZ files. I don't want to compile the source files and join rendered images as they will be updated.