Sabatour

So I am currently running a 1.5.2 server with Forge 7.8.0.684 and Mo Creatures 5.2.3 and Dynmap 1.8. My question is this - can I just drop Tekkit on top of that server without blasting all the world we have built so far? I did some searching and couldnt find anything on this specifically but sorry in advance if I missed it.