I'd like to hear an answer to this as well. Been curious for quite some time if anything changed with the new stuff. I know the housing itself is cast a bit different, at least externally, not sure what year that started.
Anyways, are you trying to fix a newer truck with this carrier? I know some GM vehicles used a tone ring on the rear carrier, if putting an old carrier in a new axle with tone ring, I'd say no, it won't work.