Suho mentioned that there are 8 versions of exo's overdose choreography. He explained that K has music video version which is where he is on top of the diamond top and the other is stage version which baekhyun's on top. Same goes for M, music video version which xiumin is on top and stage version which luhan is on top.
Then there are also music video versions and stage version for EXO (K&M both together) as well but also different for Korea stage (performing Korean version, similar to the MV's queue for members) and also China stage (performing Chinese version, similar to the MV's ueue for members). So that's a total of 8.