Well according to various sites the YZ code is indeed oxford white.
My last car was a 2003 Crown Victoria that was performance white. When i had some custom work done at a professional body shop and they painted it, it did not match. He showed me his paint book and there were 7 hue variations of "performance white" had to take the car and paint book out into the sunlight match the samples to the car and then repaint the parts.
I think best thing you can do is go somewhere that sells paint to body shops, some will mix you up a custom spray can of paint. Will probably be your best option to make it match.