If the trimmer can't replace just the one piece of leather, and you need to re-upolster, one option is to do both front seats in new leather, them match the dye to the new leather. I think if you do one seat only it would stand out.
You probably can get GAHH to do the seats. They may need the patterns because this pleat size is a bit wider than other models. I would get leather samples from them because I'm not sure about what they are using, level of shine, grain etc. If these things are important to you, you have to pay attention to it.