AFAIK each one has a completely different function, so it wouldn't be redundant to take them both if you can afford it.
I used T3 with CAMP in my recent pre-vacation cut, and I definitely saw more results than with CAMP alone, so my guess is that you can run both.
Then again there are many people on here who know a heck of a lot more than I do, so just think of that as my opinion...
And I'm hoping they will chime in and answer a little question I have:
Does CAMP stimulate the thyroid at all? I never thought it did, but this post has me wondering...