CS6 > CC

I'm afraid the answer is "sometimes, sort of".

A project you have started on CS6 will open and run fine on the newest version of CC (2017).  However, the reverse isn't always true.  Adobe have added quite a few new features on the newer versions and if one of you collaborators uses one or more of these effects or features then sends you back the .sesx file, your CS6 will be unable to handle the new stuff.

Depending on how you have to work together, if they render all the effects in each track and send you completed stems, you might be able to work that way but it bears some thinking about.