What makes them so different, for goodness sake??
If you are talking about the livery, or the fact that the black
"smile" under the windscreen is missing, it is as simple as a bit
of paint to paint it over. 9888 is exactly the same as the rest of
them, they have the same gearbox, same engine, same body.
Don't be so pedantic, please...it's a bus! 
