I don't think that has ever been in question, I've personally keyed both styles without issue. The question was (at least it appeared to be) what's the difference so that they can buy the right part. I'm going to go out on a limb here and say that based on the subsequent responses/questions, it would be highly advised that this person go to a dealer and let them do it.
Maybe I'm just not 'getting it', but you know if your bike is keyed or not, buy the parts that fit the description of your bike and don't worry about the parts that don't. It doesn't matter what the difference is, just buy the parts that are listed as correct.