Reply to s4 connect to ns6

hello,

i need help in connecting my s4 to a numark ns6. since they are both controllers and have the 4 channel mixer i was wondering if this is possible to connect the two together? the reason i want to do this is because i have a gig coming up with a friend and he is more comfortable using his ns6 then using my s4. We plan to be going b2b all evening so thats why i was wondering how we can connect the two together. if any one can plz help it would be much appreciated. i know as far as software goes for the ns6 it uses serato itch so idk if that would be a problem when connecting to the s4.