I've never heard the feather step called anything else. American smooth steps often have different names in the different syllabuses, but international is really codified with just one syllabus. The feather step is one of the basics, so anyone who knows International will certainly know it.
I'm a bit unclear on the format. Is is a solo show? If so, it shouldn't matter what steps you do. If it's a formation routine with a bunch of couples, again, if you are all doing the same steps, collisions shouldn't be a problem if he spaces you out appropriately.
Umm, are you sure your instructor knows what International is? Not meaning any slur on your instructor, but I have heard of instructors who are under the impression that American silver is "international" and don't know that there is a whole other style.