Reply to Traktor pro vs traktor scratch pro2

This is probably a dumb question but I am still somewhat new to traktor and I need some help. I have been using Traktor Pro for the past 6 months with a cheap controller. Recently I upgraded to the S4 (Love it) and the person I bought it from gave me his copy of scratch pro 2 along with it. My goal is to add a turntable to the mix so I can scratch when I feel the need. My question is do I need to run scratch pro 2 in order to do that or will my latest version of Traktor Pro be able to do this. I went to load the scratch pro 2 disk onto my computer and it said it was going to over ride my current version which is just traktor pro 2. I'm confused......................Help.