Reply to Traktor Scratch Duo + S4

I recently got the traktor scratch duo to be able to use with cdjs/turntables in the club. I have already had the traktor pro 2 installed with my s4, so could I install traktor scratch duo and then use my s4 along with attached turntables and use that for Deck A & B... Or do I need to just upgrade to traktor scratch pro in order to use the s4 with cdjs/turntables? Hope this made since haha. Thanks in advance!