Yes they are the same. You can also use a one for a 300ex. Only one I'm not sure of is a 400ex. I wouldnt dought the bolt pattern are all the same.
I have some LT +3 arms. I have yet to bolt them up but they look to be built great. I called with a few questions about shock length and their LT80 Aarms and swing arm extender. Ed had all the in I need and was easy to talk with.