POSKY 777-200/300

I know there's a long thread about POSky's 777 and getting the gauges to work. The 777-300 works fine, but I really want the United Airlines textures available for it. POSky has different textures available for the 777-200, but I can't get them to work properly. And after losing my 737s a couple times after following POSky's readme, I don't trust it. Is it possible to take the texture files from the 777-200 and apply it to the 300?