Hi babylisa4 - Technically, the loin is a wholesale cut of pork. From this, many "retail" cuts are made. These cuts include things like:
loin roasts
tenderloin
loin chops
At least that is the way it is described in my old recipe books from my grandmother & great great aunt.
So, yes, they are interchangeable. In fact, the last number of times I've made this I've used tenderloin that I bought in a cryovac package & split up. Years ago, I used a less expensive cut.