2015 Difference between rear bumper with or without park assist

[SRSatt]

Does the rear bumper assembly without rear park assist on a 2015 1500 Sierra have pre-existing holes behind the fascia (Bumper cover) for park assist?  In other words can i locate drilled holes behind the bumper cover and install park assist sensors?  I am trying to determine if i can make a non park assist bumper assembly into a  park assist bumper?  Many Thanks